diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 0fdf931e..4e3b3566 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -33,6 +33,7 @@ set(BENCHMARK_HEADERS
 )
 set(BENCHMARK_SOURCES
   ${SOURCES_DIR}/benchmark/catch_chronometer.cpp
+  ${SOURCES_DIR}/benchmark/detail/catch_analyse.cpp
   ${SOURCES_DIR}/benchmark/detail/catch_benchmark_function.cpp
   ${SOURCES_DIR}/benchmark/detail/catch_run_for_at_least.cpp
   ${SOURCES_DIR}/benchmark/detail/catch_stats.cpp
diff --git a/src/catch2/benchmark/catch_benchmark.hpp b/src/catch2/benchmark/catch_benchmark.hpp
index ea8ffa75..3db40bb0 100644
--- a/src/catch2/benchmark/catch_benchmark.hpp
+++ b/src/catch2/benchmark/catch_benchmark.hpp
@@ -45,16 +45,18 @@ namespace Catch {
                 : fun(CATCH_MOVE(func)), name(CATCH_MOVE(benchmarkName)) {}
 
             template <typename Clock>
-            ExecutionPlan<FloatDuration<Clock>> prepare(const IConfig &cfg, Environment<FloatDuration<Clock>> env) const {
+            ExecutionPlan prepare(const IConfig &cfg, Environment env) const {
                 auto min_time = env.clock_resolution.mean * Detail::minimum_ticks;
                 auto run_time = std::max(min_time, std::chrono::duration_cast<decltype(min_time)>(cfg.benchmarkWarmupTime()));
-                auto&& test = Detail::run_for_at_least<Clock>(std::chrono::duration_cast<ClockDuration<Clock>>(run_time), 1, fun);
+                auto&& test = Detail::run_for_at_least<Clock>(std::chrono::duration_cast<IDuration>(run_time), 1, fun);
                 int new_iters = static_cast<int>(std::ceil(min_time * test.iterations / test.elapsed));
-                return { new_iters, test.elapsed / test.iterations * new_iters * cfg.benchmarkSamples(), fun, std::chrono::duration_cast<FloatDuration<Clock>>(cfg.benchmarkWarmupTime()), Detail::warmup_iterations };
+                return { new_iters, test.elapsed / test.iterations * new_iters * cfg.benchmarkSamples(), fun, std::chrono::duration_cast<FDuration>(cfg.benchmarkWarmupTime()), Detail::warmup_iterations };
             }
 
             template <typename Clock = default_clock>
             void run() {
+                static_assert( Clock::is_steady,
+                               "Benchmarking clock should be steady" );
                 auto const* cfg = getCurrentContext().getConfig();
 
                 auto env = Detail::measure_environment<Clock>();
@@ -81,8 +83,8 @@ namespace Catch {
                         return plan.template run<Clock>(*cfg, env);
                     });
 
-                    auto analysis = Detail::analyse(*cfg, env, samples.begin(), samples.end());
-                    BenchmarkStats<FloatDuration<Clock>> stats{ CATCH_MOVE(info), CATCH_MOVE(analysis.samples), analysis.mean, analysis.standard_deviation, analysis.outliers, analysis.outlier_variance };
+                    auto analysis = Detail::analyse(*cfg, samples.data(), samples.data() + samples.size());
+                    BenchmarkStats<> stats{ CATCH_MOVE(info), CATCH_MOVE(analysis.samples), analysis.mean, analysis.standard_deviation, analysis.outliers, analysis.outlier_variance };
                     getResultCapture().benchmarkEnded(stats);
                 } CATCH_CATCH_ANON (TestFailureException const&) {
                     getResultCapture().benchmarkFailed("Benchmark failed due to failed assertion"_sr);
diff --git a/src/catch2/benchmark/catch_chronometer.hpp b/src/catch2/benchmark/catch_chronometer.hpp
index c3f81306..95498e6b 100644
--- a/src/catch2/benchmark/catch_chronometer.hpp
+++ b/src/catch2/benchmark/catch_chronometer.hpp
@@ -32,7 +32,10 @@ namespace Catch {
                 void start() override { started = Clock::now(); }
                 void finish() override { finished = Clock::now(); }
 
-                ClockDuration<Clock> elapsed() const { return finished - started; }
+                IDuration elapsed() const {
+                    return std::chrono::duration_cast<std::chrono::nanoseconds>(
+                        finished - started );
+                }
 
                 TimePoint<Clock> started;
                 TimePoint<Clock> finished;
diff --git a/src/catch2/benchmark/catch_clock.hpp b/src/catch2/benchmark/catch_clock.hpp
index cee46097..4068c4d2 100644
--- a/src/catch2/benchmark/catch_clock.hpp
+++ b/src/catch2/benchmark/catch_clock.hpp
@@ -11,28 +11,16 @@
 #define CATCH_CLOCK_HPP_INCLUDED
 
 #include <chrono>
-#include <ratio>
 
 namespace Catch {
     namespace Benchmark {
-        template <typename Clock>
-        using ClockDuration = typename Clock::duration;
-        template <typename Clock>
-        using FloatDuration = std::chrono::duration<double, typename Clock::period>;
+        using IDuration = std::chrono::nanoseconds;
+        using FDuration = std::chrono::duration<double, std::nano>;
 
         template <typename Clock>
         using TimePoint = typename Clock::time_point;
 
         using default_clock = std::chrono::steady_clock;
-
-        template <typename Clock>
-        struct now {
-            TimePoint<Clock> operator()() const {
-                return Clock::now();
-            }
-        };
-
-        using fp_seconds = std::chrono::duration<double, std::ratio<1>>;
     } // namespace Benchmark
 } // namespace Catch
 
diff --git a/src/catch2/benchmark/catch_environment.hpp b/src/catch2/benchmark/catch_environment.hpp
index 5d3816a5..da3f2fa9 100644
--- a/src/catch2/benchmark/catch_environment.hpp
+++ b/src/catch2/benchmark/catch_environment.hpp
@@ -15,20 +15,13 @@
 
 namespace Catch {
     namespace Benchmark {
-        template <typename Duration>
         struct EnvironmentEstimate {
-            Duration mean;
+            FDuration mean;
             OutlierClassification outliers;
-
-            template <typename Duration2>
-            operator EnvironmentEstimate<Duration2>() const {
-                return { mean, outliers };
-            }
         };
-        template <typename Clock>
         struct Environment {
-            EnvironmentEstimate<FloatDuration<Clock>> clock_resolution;
-            EnvironmentEstimate<FloatDuration<Clock>> clock_cost;
+            EnvironmentEstimate clock_resolution;
+            EnvironmentEstimate clock_cost;
         };
     } // namespace Benchmark
 } // namespace Catch
diff --git a/src/catch2/benchmark/catch_estimate.hpp b/src/catch2/benchmark/catch_estimate.hpp
index be594a18..64383a2e 100644
--- a/src/catch2/benchmark/catch_estimate.hpp
+++ b/src/catch2/benchmark/catch_estimate.hpp
@@ -12,17 +12,12 @@
 
 namespace Catch {
     namespace Benchmark {
-        template <typename Duration>
+        template <typename Type>
         struct Estimate {
-            Duration point;
-            Duration lower_bound;
-            Duration upper_bound;
+            Type point;
+            Type lower_bound;
+            Type upper_bound;
             double confidence_interval;
-
-            template <typename Duration2>
-            operator Estimate<Duration2>() const {
-                return { point, lower_bound, upper_bound, confidence_interval };
-            }
         };
     } // namespace Benchmark
 } // namespace Catch
diff --git a/src/catch2/benchmark/catch_execution_plan.hpp b/src/catch2/benchmark/catch_execution_plan.hpp
index 4f60a646..17ca589f 100644
--- a/src/catch2/benchmark/catch_execution_plan.hpp
+++ b/src/catch2/benchmark/catch_execution_plan.hpp
@@ -21,33 +21,31 @@
 
 namespace Catch {
     namespace Benchmark {
-        template <typename Duration>
         struct ExecutionPlan {
             int iterations_per_sample;
-            Duration estimated_duration;
+            FDuration estimated_duration;
             Detail::BenchmarkFunction benchmark;
-            Duration warmup_time;
+            FDuration warmup_time;
             int warmup_iterations;
 
-            template <typename Duration2>
-            operator ExecutionPlan<Duration2>() const {
-                return { iterations_per_sample, estimated_duration, benchmark, warmup_time, warmup_iterations };
-            }
-
             template <typename Clock>
-            std::vector<FloatDuration<Clock>> run(const IConfig &cfg, Environment<FloatDuration<Clock>> env) const {
+            std::vector<FDuration> run(const IConfig &cfg, Environment env) const {
                 // warmup a bit
-                Detail::run_for_at_least<Clock>(std::chrono::duration_cast<ClockDuration<Clock>>(warmup_time), warmup_iterations, Detail::repeat(now<Clock>{}));
+                Detail::run_for_at_least<Clock>(
+                    std::chrono::duration_cast<IDuration>( warmup_time ),
+                    warmup_iterations,
+                    Detail::repeat( []() { return Clock::now(); } )
+                );
 
-                std::vector<FloatDuration<Clock>> times;
+                std::vector<FDuration> times;
                 const auto num_samples = cfg.benchmarkSamples();
                 times.reserve( num_samples );
                 for ( size_t i = 0; i < num_samples; ++i ) {
                     Detail::ChronometerModel<Clock> model;
                     this->benchmark( Chronometer( model, iterations_per_sample ) );
                     auto sample_time = model.elapsed() - env.clock_cost.mean;
-                    if ( sample_time < FloatDuration<Clock>::zero() ) {
-                        sample_time = FloatDuration<Clock>::zero();
+                    if ( sample_time < FDuration::zero() ) {
+                        sample_time = FDuration::zero();
                     }
                     times.push_back(sample_time / iterations_per_sample);
                 }
diff --git a/src/catch2/benchmark/catch_sample_analysis.hpp b/src/catch2/benchmark/catch_sample_analysis.hpp
index 97b8fe50..aeb87d05 100644
--- a/src/catch2/benchmark/catch_sample_analysis.hpp
+++ b/src/catch2/benchmark/catch_sample_analysis.hpp
@@ -12,35 +12,18 @@
 
 #include <catch2/benchmark/catch_estimate.hpp>
 #include <catch2/benchmark/catch_outlier_classification.hpp>
-#include <catch2/internal/catch_move_and_forward.hpp>
+#include <catch2/benchmark/catch_clock.hpp>
 
 #include <vector>
 
 namespace Catch {
     namespace Benchmark {
-        template <typename Duration>
         struct SampleAnalysis {
-            std::vector<Duration> samples;
-            Estimate<Duration> mean;
-            Estimate<Duration> standard_deviation;
+            std::vector<FDuration> samples;
+            Estimate<FDuration> mean;
+            Estimate<FDuration> standard_deviation;
             OutlierClassification outliers;
             double outlier_variance;
-
-            template <typename Duration2>
-            operator SampleAnalysis<Duration2>() const {
-                std::vector<Duration2> samples2;
-                samples2.reserve(samples.size());
-                for (auto const& d : samples) {
-                    samples2.push_back(Duration2(d));
-                }
-                return {
-                    CATCH_MOVE(samples2),
-                    mean,
-                    standard_deviation,
-                    outliers,
-                    outlier_variance,
-                };
-            }
         };
     } // namespace Benchmark
 } // namespace Catch
diff --git a/src/catch2/benchmark/detail/catch_analyse.cpp b/src/catch2/benchmark/detail/catch_analyse.cpp
new file mode 100644
index 00000000..7d27daf1
--- /dev/null
+++ b/src/catch2/benchmark/detail/catch_analyse.cpp
@@ -0,0 +1,85 @@
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+// Adapted from donated nonius code.
+
+#include <catch2/benchmark/detail/catch_analyse.hpp>
+#include <catch2/benchmark/catch_clock.hpp>
+#include <catch2/benchmark/catch_sample_analysis.hpp>
+#include <catch2/benchmark/detail/catch_stats.hpp>
+#include <catch2/interfaces/catch_interfaces_config.hpp>
+#include <catch2/internal/catch_move_and_forward.hpp>
+
+#include <vector>
+
+namespace Catch {
+    namespace Benchmark {
+        namespace Detail {
+            SampleAnalysis analyse(const IConfig &cfg, FDuration* first, FDuration* last) {
+                if (!cfg.benchmarkNoAnalysis()) {
+                    std::vector<double> samples;
+                    samples.reserve(static_cast<size_t>(last - first));
+                    for (auto current = first; current != last; ++current) {
+                        samples.push_back( current->count() );
+                    }
+
+                    auto analysis = Catch::Benchmark::Detail::analyse_samples(
+                        cfg.benchmarkConfidenceInterval(),
+                        cfg.benchmarkResamples(),
+                        samples.data(),
+                        samples.data() + samples.size() );
+                    auto outliers = Catch::Benchmark::Detail::classify_outliers(
+                        samples.data(), samples.data() + samples.size() );
+
+                    auto wrap_estimate = [](Estimate<double> e) {
+                        return Estimate<FDuration> {
+                            FDuration(e.point),
+                                FDuration(e.lower_bound),
+                                FDuration(e.upper_bound),
+                                e.confidence_interval,
+                        };
+                    };
+                    std::vector<FDuration> samples2;
+                    samples2.reserve(samples.size());
+                    for (auto s : samples) {
+                        samples2.push_back( FDuration( s ) );
+                    }
+
+                    return {
+                        CATCH_MOVE(samples2),
+                        wrap_estimate(analysis.mean),
+                        wrap_estimate(analysis.standard_deviation),
+                        outliers,
+                        analysis.outlier_variance,
+                    };
+                } else {
+                    std::vector<FDuration> samples;
+                    samples.reserve(static_cast<size_t>(last - first));
+
+                    FDuration mean = FDuration(0);
+                    int i = 0;
+                    for (auto it = first; it < last; ++it, ++i) {
+                        samples.push_back(FDuration(*it));
+                        mean += FDuration(*it);
+                    }
+                    mean /= i;
+
+                    return SampleAnalysis{
+                        CATCH_MOVE(samples),
+                        Estimate<FDuration>{ mean, mean, mean, 0.0 },
+                        Estimate<FDuration>{ FDuration( 0 ),
+                                             FDuration( 0 ),
+                                             FDuration( 0 ),
+                                             0.0 },
+                        OutlierClassification{},
+                        0.0
+                    };
+                }
+            }
+        } // namespace Detail
+    } // namespace Benchmark
+} // namespace Catch
diff --git a/src/catch2/benchmark/detail/catch_analyse.hpp b/src/catch2/benchmark/detail/catch_analyse.hpp
index 60db7d87..5e3f7b0f 100644
--- a/src/catch2/benchmark/detail/catch_analyse.hpp
+++ b/src/catch2/benchmark/detail/catch_analyse.hpp
@@ -10,76 +10,16 @@
 #ifndef CATCH_ANALYSE_HPP_INCLUDED
 #define CATCH_ANALYSE_HPP_INCLUDED
 
-#include <catch2/benchmark/catch_environment.hpp>
+#include <catch2/benchmark/catch_clock.hpp>
 #include <catch2/benchmark/catch_sample_analysis.hpp>
-#include <catch2/benchmark/detail/catch_stats.hpp>
-#include <catch2/interfaces/catch_interfaces_config.hpp>
-#include <catch2/internal/catch_move_and_forward.hpp>
 
-#include <vector>
 
 namespace Catch {
+    class IConfig;
+
     namespace Benchmark {
         namespace Detail {
-            template <typename Duration, typename Iterator>
-            SampleAnalysis<Duration> analyse(const IConfig &cfg, Environment<Duration>, Iterator first, Iterator last) {
-                if (!cfg.benchmarkNoAnalysis()) {
-                    std::vector<double> samples;
-                    samples.reserve(static_cast<size_t>(last - first));
-                    for (auto current = first; current != last; ++current) {
-                        samples.push_back( current->count() );
-                    }
-
-                    auto analysis = Catch::Benchmark::Detail::analyse_samples(
-                        cfg.benchmarkConfidenceInterval(),
-                        cfg.benchmarkResamples(),
-                        samples.data(),
-                        samples.data() + samples.size() );
-                    auto outliers = Catch::Benchmark::Detail::classify_outliers(
-                        samples.data(), samples.data() + samples.size() );
-
-                    auto wrap_estimate = [](Estimate<double> e) {
-                        return Estimate<Duration> {
-                            Duration(e.point),
-                                Duration(e.lower_bound),
-                                Duration(e.upper_bound),
-                                e.confidence_interval,
-                        };
-                    };
-                    std::vector<Duration> samples2;
-                    samples2.reserve(samples.size());
-                    for (auto s : samples) {
-                        samples2.push_back( Duration( s ) );
-                    }
-
-                    return {
-                        CATCH_MOVE(samples2),
-                        wrap_estimate(analysis.mean),
-                        wrap_estimate(analysis.standard_deviation),
-                        outliers,
-                        analysis.outlier_variance,
-                    };
-                } else {
-                    std::vector<Duration> samples;
-                    samples.reserve(static_cast<size_t>(last - first));
-
-                    Duration mean = Duration(0);
-                    int i = 0;
-                    for (auto it = first; it < last; ++it, ++i) {
-                        samples.push_back(Duration(*it));
-                        mean += Duration(*it);
-                    }
-                    mean /= i;
-
-                    return {
-                        CATCH_MOVE(samples),
-                        Estimate<Duration>{mean, mean, mean, 0.0},
-                        Estimate<Duration>{Duration(0), Duration(0), Duration(0), 0.0},
-                        OutlierClassification{},
-                        0.0
-                    };
-                }
-            }
+            SampleAnalysis analyse(const IConfig &cfg, FDuration* first, FDuration* last);
         } // namespace Detail
     } // namespace Benchmark
 } // namespace Catch
diff --git a/src/catch2/benchmark/detail/catch_benchmark_stats.hpp b/src/catch2/benchmark/detail/catch_benchmark_stats.hpp
index a8b3494e..3633bc9f 100644
--- a/src/catch2/benchmark/detail/catch_benchmark_stats.hpp
+++ b/src/catch2/benchmark/detail/catch_benchmark_stats.hpp
@@ -8,7 +8,6 @@
 #ifndef CATCH_BENCHMARK_STATS_HPP_INCLUDED
 #define CATCH_BENCHMARK_STATS_HPP_INCLUDED
 
-#include <catch2/internal/catch_move_and_forward.hpp>
 #include <catch2/benchmark/catch_estimate.hpp>
 #include <catch2/benchmark/catch_outlier_classification.hpp>
 // The fwd decl & default specialization needs to be seen by VS2017 before
@@ -30,32 +29,17 @@ namespace Catch {
         double clockCost;
     };
 
-    template <class Duration>
+    // We need to keep template parameter for backwards compatibility,
+    // but we also do not want to use the template paraneter.
+    template <class Dummy>
     struct BenchmarkStats {
         BenchmarkInfo info;
 
-        std::vector<Duration> samples;
-        Benchmark::Estimate<Duration> mean;
-        Benchmark::Estimate<Duration> standardDeviation;
+        std::vector<Benchmark::FDuration> samples;
+        Benchmark::Estimate<Benchmark::FDuration> mean;
+        Benchmark::Estimate<Benchmark::FDuration> standardDeviation;
         Benchmark::OutlierClassification outliers;
         double outlierVariance;
-
-        template <typename Duration2>
-        operator BenchmarkStats<Duration2>() const {
-            std::vector<Duration2> samples2;
-            samples2.reserve(samples.size());
-            for (auto const& sample : samples) {
-                samples2.push_back(Duration2(sample));
-            }
-            return {
-                info,
-                CATCH_MOVE(samples2),
-                mean,
-                standardDeviation,
-                outliers,
-                outlierVariance,
-            };
-        }
     };
 
 
diff --git a/src/catch2/benchmark/detail/catch_benchmark_stats_fwd.hpp b/src/catch2/benchmark/detail/catch_benchmark_stats_fwd.hpp
index 60772561..2ccc25d5 100644
--- a/src/catch2/benchmark/detail/catch_benchmark_stats_fwd.hpp
+++ b/src/catch2/benchmark/detail/catch_benchmark_stats_fwd.hpp
@@ -8,14 +8,14 @@
 #ifndef CATCH_BENCHMARK_STATS_FWD_HPP_INCLUDED
 #define CATCH_BENCHMARK_STATS_FWD_HPP_INCLUDED
 
-#include <chrono>
+#include <catch2/benchmark/catch_clock.hpp>
 
 namespace Catch {
 
     // We cannot forward declare the type with default template argument
     // multiple times, so it is split out into a separate header so that
     // we can prevent multiple declarations in dependees
-    template <typename Duration = std::chrono::duration<double, std::nano>>
+    template <typename Duration = Benchmark::FDuration>
     struct BenchmarkStats;
 
 } // end namespace Catch
diff --git a/src/catch2/benchmark/detail/catch_estimate_clock.hpp b/src/catch2/benchmark/detail/catch_estimate_clock.hpp
index a0dc2d3d..918484a9 100644
--- a/src/catch2/benchmark/detail/catch_estimate_clock.hpp
+++ b/src/catch2/benchmark/detail/catch_estimate_clock.hpp
@@ -55,23 +55,23 @@ namespace Catch {
 
             template <typename Clock>
             int warmup() {
-                return run_for_at_least<Clock>(std::chrono::duration_cast<ClockDuration<Clock>>(warmup_time), warmup_seed, &resolution<Clock>)
+                return run_for_at_least<Clock>(std::chrono::duration_cast<IDuration>(warmup_time), warmup_seed, &resolution<Clock>)
                     .iterations;
             }
             template <typename Clock>
-            EnvironmentEstimate<FloatDuration<Clock>> estimate_clock_resolution(int iterations) {
-                auto r = run_for_at_least<Clock>(std::chrono::duration_cast<ClockDuration<Clock>>(clock_resolution_estimation_time), iterations, &resolution<Clock>)
+            EnvironmentEstimate estimate_clock_resolution(int iterations) {
+                auto r = run_for_at_least<Clock>(std::chrono::duration_cast<IDuration>(clock_resolution_estimation_time), iterations, &resolution<Clock>)
                     .result;
                 return {
-                    FloatDuration<Clock>(mean(r.data(), r.data() + r.size())),
+                    FDuration(mean(r.data(), r.data() + r.size())),
                     classify_outliers(r.data(), r.data() + r.size()),
                 };
             }
             template <typename Clock>
-            EnvironmentEstimate<FloatDuration<Clock>> estimate_clock_cost(FloatDuration<Clock> resolution) {
+            EnvironmentEstimate estimate_clock_cost(FDuration resolution) {
                 auto time_limit = (std::min)(
                     resolution * clock_cost_estimation_tick_limit,
-                    FloatDuration<Clock>(clock_cost_estimation_time_limit));
+                    FDuration(clock_cost_estimation_time_limit));
                 auto time_clock = [](int k) {
                     return Detail::measure<Clock>([k] {
                         for (int i = 0; i < k; ++i) {
@@ -82,7 +82,7 @@ namespace Catch {
                 };
                 time_clock(1);
                 int iters = clock_cost_estimation_iterations;
-                auto&& r = run_for_at_least<Clock>(std::chrono::duration_cast<ClockDuration<Clock>>(clock_cost_estimation_time), iters, time_clock);
+                auto&& r = run_for_at_least<Clock>(std::chrono::duration_cast<IDuration>(clock_cost_estimation_time), iters, time_clock);
                 std::vector<double> times;
                 int nsamples = static_cast<int>(std::ceil(time_limit / r.elapsed));
                 times.reserve(static_cast<size_t>(nsamples));
@@ -92,18 +92,18 @@ namespace Catch {
                             .count() ) );
                 }
                 return {
-                    FloatDuration<Clock>(mean(times.data(), times.data() + times.size())),
+                    FDuration(mean(times.data(), times.data() + times.size())),
                     classify_outliers(times.data(), times.data() + times.size()),
                 };
             }
 
             template <typename Clock>
-            Environment<FloatDuration<Clock>> measure_environment() {
+            Environment measure_environment() {
 #if defined(__clang__)
 #    pragma clang diagnostic push
 #    pragma clang diagnostic ignored "-Wexit-time-destructors"
 #endif
-                static Catch::Detail::unique_ptr<Environment<FloatDuration<Clock>>> env;
+                static Catch::Detail::unique_ptr<Environment> env;
 #if defined(__clang__)
 #    pragma clang diagnostic pop
 #endif
@@ -115,7 +115,7 @@ namespace Catch {
                 auto resolution = Detail::estimate_clock_resolution<Clock>(iters);
                 auto cost = Detail::estimate_clock_cost<Clock>(resolution.mean);
 
-                env = Catch::Detail::make_unique<Environment<FloatDuration<Clock>>>( Environment<FloatDuration<Clock>>{resolution, cost} );
+                env = Catch::Detail::make_unique<Environment>( Environment{resolution, cost} );
                 return *env;
             }
         } // namespace Detail
diff --git a/src/catch2/benchmark/detail/catch_measure.hpp b/src/catch2/benchmark/detail/catch_measure.hpp
index 1a30efab..37494a68 100644
--- a/src/catch2/benchmark/detail/catch_measure.hpp
+++ b/src/catch2/benchmark/detail/catch_measure.hpp
@@ -18,7 +18,7 @@ namespace Catch {
     namespace Benchmark {
         namespace Detail {
             template <typename Clock, typename Fun, typename... Args>
-            TimingOf<Clock, Fun, Args...> measure(Fun&& fun, Args&&... args) {
+            TimingOf<Fun, Args...> measure(Fun&& fun, Args&&... args) {
                 auto start = Clock::now();
                 auto&& r = Detail::complete_invoke(fun, CATCH_FORWARD(args)...);
                 auto end = Clock::now();
diff --git a/src/catch2/benchmark/detail/catch_run_for_at_least.hpp b/src/catch2/benchmark/detail/catch_run_for_at_least.hpp
index 976a4b24..4dfa8bbb 100644
--- a/src/catch2/benchmark/detail/catch_run_for_at_least.hpp
+++ b/src/catch2/benchmark/detail/catch_run_for_at_least.hpp
@@ -24,11 +24,11 @@ namespace Catch {
     namespace Benchmark {
         namespace Detail {
             template <typename Clock, typename Fun>
-            TimingOf<Clock, Fun, int> measure_one(Fun&& fun, int iters, std::false_type) {
+            TimingOf<Fun, int> measure_one(Fun&& fun, int iters, std::false_type) {
                 return Detail::measure<Clock>(fun, iters);
             }
             template <typename Clock, typename Fun>
-            TimingOf<Clock, Fun, Chronometer> measure_one(Fun&& fun, int iters, std::true_type) {
+            TimingOf<Fun, Chronometer> measure_one(Fun&& fun, int iters, std::true_type) {
                 Detail::ChronometerModel<Clock> meter;
                 auto&& result = Detail::complete_invoke(fun, Chronometer(meter, iters));
 
@@ -43,8 +43,8 @@ namespace Catch {
             void throw_optimized_away_error();
 
             template <typename Clock, typename Fun>
-            TimingOf<Clock, Fun, run_for_at_least_argument_t<Clock, Fun>>
-                run_for_at_least(ClockDuration<Clock> how_long,
+            TimingOf<Fun, run_for_at_least_argument_t<Clock, Fun>>
+                run_for_at_least(IDuration how_long,
                                  const int initial_iterations,
                                  Fun&& fun) {
                 auto iters = initial_iterations;
diff --git a/src/catch2/benchmark/detail/catch_stats.cpp b/src/catch2/benchmark/detail/catch_stats.cpp
index caad0167..fe64b1c5 100644
--- a/src/catch2/benchmark/detail/catch_stats.cpp
+++ b/src/catch2/benchmark/detail/catch_stats.cpp
@@ -11,7 +11,9 @@
 
 #include <catch2/internal/catch_compiler_capabilities.hpp>
 
+#include <algorithm>
 #include <cassert>
+#include <cmath>
 #include <cstddef>
 #include <numeric>
 #include <random>
@@ -257,6 +259,27 @@ namespace Catch {
                 return sum / static_cast<double>(count);
             }
 
+            sample jackknife( double ( *estimator )( double const*,
+                                                     double const* ),
+                              double* first,
+                              double* last ) {
+                auto n = static_cast<size_t>( last - first );
+                auto second = first;
+                ++second;
+                sample results;
+                results.reserve( n );
+
+                for ( auto it = first; it != last; ++it ) {
+                    std::iter_swap( it, first );
+                    results.push_back( estimator( second, last ) );
+                }
+
+                return results;
+            }
+
+            double normal_cdf( double x ) {
+                return std::erfc( -x / std::sqrt( 2.0 ) ) / 2.0;
+            }
 
             double erfc_inv(double x) {
                 return erf_inv(1.0 - x);
@@ -278,6 +301,64 @@ namespace Catch {
                 return result;
             }
 
+            Estimate<double>
+            bootstrap( double confidence_level,
+                       double* first,
+                       double* last,
+                       sample const& resample,
+                       double ( *estimator )( double const*, double const* ) ) {
+                auto n_samples = last - first;
+
+                double point = estimator( first, last );
+                // Degenerate case with a single sample
+                if ( n_samples == 1 )
+                    return { point, point, point, confidence_level };
+
+                sample jack = jackknife( estimator, first, last );
+                double jack_mean =
+                    mean( jack.data(), jack.data() + jack.size() );
+                double sum_squares = 0, sum_cubes = 0;
+                for ( double x : jack ) {
+                    auto difference = jack_mean - x;
+                    auto square = difference * difference;
+                    auto cube = square * difference;
+                    sum_squares += square;
+                    sum_cubes += cube;
+                }
+
+                double accel = sum_cubes / ( 6 * std::pow( sum_squares, 1.5 ) );
+                long n = static_cast<long>( resample.size() );
+                double prob_n =
+                    std::count_if( resample.begin(),
+                                   resample.end(),
+                                   [point]( double x ) { return x < point; } ) /
+                    static_cast<double>( n );
+                // degenerate case with uniform samples
+                if ( directCompare( prob_n, 0. ) ) {
+                    return { point, point, point, confidence_level };
+                }
+
+                double bias = normal_quantile( prob_n );
+                double z1 = normal_quantile( ( 1. - confidence_level ) / 2. );
+
+                auto cumn = [n]( double x ) -> long {
+                    return std::lround( normal_cdf( x ) *
+                                        static_cast<double>( n ) );
+                };
+                auto a = [bias, accel]( double b ) {
+                    return bias + b / ( 1. - accel * b );
+                };
+                double b1 = bias + z1;
+                double b2 = bias - z1;
+                double a1 = a( b1 );
+                double a2 = a( b2 );
+                auto lo = static_cast<size_t>( (std::max)( cumn( a1 ), 0l ) );
+                auto hi =
+                    static_cast<size_t>( (std::min)( cumn( a2 ), n - 1 ) );
+
+                return { point, resample[lo], resample[hi], confidence_level };
+            }
+
             bootstrap_analysis analyse_samples(double confidence_level,
                                                unsigned int n_resamples,
                                                double* first,
diff --git a/src/catch2/benchmark/detail/catch_stats.hpp b/src/catch2/benchmark/detail/catch_stats.hpp
index 54621670..9450406b 100644
--- a/src/catch2/benchmark/detail/catch_stats.hpp
+++ b/src/catch2/benchmark/detail/catch_stats.hpp
@@ -13,9 +13,7 @@
 #include <catch2/benchmark/catch_estimate.hpp>
 #include <catch2/benchmark/catch_outlier_classification.hpp>
 
-#include <algorithm>
 #include <vector>
-#include <cmath>
 
 namespace Catch {
     namespace Benchmark {
@@ -36,78 +34,23 @@ namespace Catch {
 
             double mean( double const* first, double const* last );
 
-            template <typename Estimator>
-            sample jackknife(Estimator&& estimator,
-                             double* first,
-                             double* last) {
-                auto n = static_cast<size_t>(last - first);
-                auto second = first;
-                ++second;
-                sample results;
-                results.reserve(n);
+            sample jackknife( double ( *estimator )( double const*,
+                                                     double const* ),
+                              double* first,
+                              double* last );
 
-                for (auto it = first; it != last; ++it) {
-                    std::iter_swap(it, first);
-                    results.push_back(estimator(second, last));
-                }
-
-                return results;
-            }
-
-            inline double normal_cdf(double x) {
-                return std::erfc(-x / std::sqrt(2.0)) / 2.0;
-            }
+            double normal_cdf( double x );
 
             double erfc_inv(double x);
 
             double normal_quantile(double p);
 
-            template <typename Estimator>
-            Estimate<double> bootstrap( double confidence_level,
-                                        double* first,
-                                        double* last,
-                                        sample const& resample,
-                                        Estimator&& estimator ) {
-                auto n_samples = last - first;
-
-                double point = estimator(first, last);
-                // Degenerate case with a single sample
-                if (n_samples == 1) return { point, point, point, confidence_level };
-
-                sample jack = jackknife(estimator, first, last);
-                double jack_mean = mean(jack.data(), jack.data() + jack.size());
-                double sum_squares = 0, sum_cubes = 0;
-                for (double x : jack) {
-                    auto difference = jack_mean - x;
-                    auto square = difference * difference;
-                    auto cube = square * difference;
-                    sum_squares += square; sum_cubes += cube;
-                }
-
-                double accel = sum_cubes / (6 * std::pow(sum_squares, 1.5));
-                long n = static_cast<long>(resample.size());
-                double prob_n = std::count_if(resample.begin(), resample.end(), [point](double x) { return x < point; }) / static_cast<double>(n);
-                // degenerate case with uniform samples
-                if ( directCompare( prob_n, 0. ) ) {
-                    return { point, point, point, confidence_level };
-                }
-
-                double bias = normal_quantile(prob_n);
-                double z1 = normal_quantile((1. - confidence_level) / 2.);
-
-                auto cumn = [n]( double x ) -> long {
-                    return std::lround( normal_cdf( x ) * static_cast<double>(n) );
-                };
-                auto a = [bias, accel](double b) { return bias + b / (1. - accel * b); };
-                double b1 = bias + z1;
-                double b2 = bias - z1;
-                double a1 = a(b1);
-                double a2 = a(b2);
-                auto lo = static_cast<size_t>((std::max)(cumn(a1), 0l));
-                auto hi = static_cast<size_t>((std::min)(cumn(a2), n - 1));
-
-                return { point, resample[lo], resample[hi], confidence_level };
-            }
+            Estimate<double>
+            bootstrap( double confidence_level,
+                       double* first,
+                       double* last,
+                       sample const& resample,
+                       double ( *estimator )( double const*, double const* ) );
 
             struct bootstrap_analysis {
                 Estimate<double> mean;
diff --git a/src/catch2/benchmark/detail/catch_timing.hpp b/src/catch2/benchmark/detail/catch_timing.hpp
index f5c25571..da567190 100644
--- a/src/catch2/benchmark/detail/catch_timing.hpp
+++ b/src/catch2/benchmark/detail/catch_timing.hpp
@@ -17,14 +17,14 @@
 
 namespace Catch {
     namespace Benchmark {
-        template <typename Duration, typename Result>
+        template <typename Result>
         struct Timing {
-            Duration elapsed;
+            IDuration elapsed;
             Result result;
             int iterations;
         };
-        template <typename Clock, typename Func, typename... Args>
-        using TimingOf = Timing<ClockDuration<Clock>, Detail::CompleteType_t<FunctionReturnType<Func, Args...>>>;
+        template <typename Func, typename... Args>
+        using TimingOf = Timing<Detail::CompleteType_t<FunctionReturnType<Func, Args...>>>;
     } // namespace Benchmark
 } // namespace Catch
 
diff --git a/src/catch2/meson.build b/src/catch2/meson.build
index 2e9469d8..f1c32219 100644
--- a/src/catch2/meson.build
+++ b/src/catch2/meson.build
@@ -45,6 +45,7 @@ benchmark_headers = [
 
 benchmark_sources = files(
   'benchmark/catch_chronometer.cpp',
+  'benchmark/detail/catch_analyse.cpp',
   'benchmark/detail/catch_benchmark_function.cpp',
   'benchmark/detail/catch_run_for_at_least.cpp',
   'benchmark/detail/catch_stats.cpp',
diff --git a/tests/SelfTest/IntrospectiveTests/InternalBenchmark.tests.cpp b/tests/SelfTest/IntrospectiveTests/InternalBenchmark.tests.cpp
index 34ed8814..bc8d715b 100644
--- a/tests/SelfTest/IntrospectiveTests/InternalBenchmark.tests.cpp
+++ b/tests/SelfTest/IntrospectiveTests/InternalBenchmark.tests.cpp
@@ -292,15 +292,13 @@ TEST_CASE("analyse", "[approvals][benchmark]") {
     data.benchmarkSamples = 99;
     Catch::Config config{data};
 
-    using Duration = Catch::Benchmark::FloatDuration<Catch::Benchmark::default_clock>;
-
-    Catch::Benchmark::Environment<Duration> env;
-    std::vector<Duration> samples(99);
+    using FDuration = Catch::Benchmark::FDuration;
+    std::vector<FDuration> samples(99);
     for (size_t i = 0; i < samples.size(); ++i) {
-        samples[i] = Duration(23 + (i % 3 - 1));
+        samples[i] = FDuration(23 + (i % 3 - 1));
     }
 
-    auto analysis = Catch::Benchmark::Detail::analyse(config, env, samples.begin(), samples.end());
+    auto analysis = Catch::Benchmark::Detail::analyse(config, samples.data(), samples.data() + samples.size());
     CHECK( analysis.mean.point.count() == 23 );
     CHECK( analysis.mean.lower_bound.count() < 23 );
     CHECK(analysis.mean.lower_bound.count() > 22);
@@ -333,15 +331,13 @@ TEST_CASE("analyse no analysis", "[benchmark]") {
     data.benchmarkSamples = 99;
     Catch::Config config{ data };
 
-    using Duration = Catch::Benchmark::FloatDuration<Catch::Benchmark::default_clock>;
-
-    Catch::Benchmark::Environment<Duration> env;
-    std::vector<Duration> samples(99);
+    using FDuration = Catch::Benchmark::FDuration;
+    std::vector<FDuration> samples(99);
     for (size_t i = 0; i < samples.size(); ++i) {
-        samples[i] = Duration(23 + (i % 3 - 1));
+        samples[i] = FDuration(23 + (i % 3 - 1));
     }
 
-    auto analysis = Catch::Benchmark::Detail::analyse(config, env, samples.begin(), samples.end());
+    auto analysis = Catch::Benchmark::Detail::analyse(config, samples.data(), samples.data() + samples.size());
     CHECK(analysis.mean.point.count() == 23);
     CHECK(analysis.mean.lower_bound.count() == 23);
     CHECK(analysis.mean.upper_bound.count() == 23);