diff --git a/src/main/java/org/gradle/profiler/GradleBuildInvocationResult.java b/src/main/java/org/gradle/profiler/GradleBuildInvocationResult.java
index 1cf8f8f3..e34f6502 100644
--- a/src/main/java/org/gradle/profiler/GradleBuildInvocationResult.java
+++ b/src/main/java/org/gradle/profiler/GradleBuildInvocationResult.java
@@ -27,7 +27,7 @@ protected Duration getDuration(GradleBuildInvocationResult result) {
         }
     };
 
-    public static Sample<GradleBuildInvocationResult> sampleBuildOperation(String buildOperationDetailsClass) {
+    public static Sample<GradleBuildInvocationResult> sampleBuildOperationDuration(String buildOperationDetailsClass) {
         return new TimeSample<GradleBuildInvocationResult>() {
             @Override
             public String getName() {
diff --git a/src/main/java/org/gradle/profiler/GradleScenarioInvoker.java b/src/main/java/org/gradle/profiler/GradleScenarioInvoker.java
index d5063c12..7b118261 100644
--- a/src/main/java/org/gradle/profiler/GradleScenarioInvoker.java
+++ b/src/main/java/org/gradle/profiler/GradleScenarioInvoker.java
@@ -37,7 +37,7 @@ public List<Sample<? super GradleBuildInvocationResult>> samplesFor(InvocationSe
             builder.add(GradleBuildInvocationResult.TIME_TO_TASK_EXECUTION);
         }
         scenario.getMeasuredBuildOperations().stream()
-            .map(GradleBuildInvocationResult::sampleBuildOperation)
+            .map(GradleBuildInvocationResult::sampleBuildOperationDuration)
             .forEach(builder::add);
         return builder.build();
     }
diff --git a/src/main/java/org/gradle/profiler/buildops/BuildOperationInstrumentation.java b/src/main/java/org/gradle/profiler/buildops/BuildOperationInstrumentation.java
index 5079028a..8d1d1542 100644
--- a/src/main/java/org/gradle/profiler/buildops/BuildOperationInstrumentation.java
+++ b/src/main/java/org/gradle/profiler/buildops/BuildOperationInstrumentation.java
@@ -90,7 +90,7 @@ public Map<String, Duration> getCumulativeBuildOperationTimes() {
     private static Duration readCumulativeTimeFromDataFile(File dataFile) {
         try {
             try (Stream<String> lines = Files.lines(dataFile.toPath(), StandardCharsets.UTF_8)) {
-                return Duration.ofMillis(lines.mapToLong(Long::parseLong).sum());
+                return Duration.ofNanos((long) lines.mapToDouble(Double::parseDouble).sum() * 1000000);
             }
         } catch (IOException e) {
             throw new RuntimeException("Could not read result from file.", e);
diff --git a/subprojects/build-operations/src/main/java/org/gradle/trace/buildops/BuildOperationTrace.java b/subprojects/build-operations/src/main/java/org/gradle/trace/buildops/BuildOperationTrace.java
index fccd6765..267e6aa4 100644
--- a/subprojects/build-operations/src/main/java/org/gradle/trace/buildops/BuildOperationTrace.java
+++ b/subprojects/build-operations/src/main/java/org/gradle/trace/buildops/BuildOperationTrace.java
@@ -25,6 +25,7 @@
 import java.util.List;
 import java.util.Map;
 import java.util.concurrent.atomic.AtomicLong;
+import java.util.concurrent.atomic.AtomicReference;
 
 @SuppressWarnings("unused")
 public class BuildOperationTrace {
@@ -95,7 +96,7 @@ public BuildOperationDurationRecordingListener() throws ClassNotFoundException {
             for (Map.Entry<String, File> entry : getParameters().getCapturedBuildOperations().get().entrySet()) {
                 String operationType = entry.getKey();
                 File outputFile = entry.getValue();
-                collectors.add(new BuildOperationCollector(Class.forName(operationType + "$Details"), outputFile));
+                collectors.add(new BuildOperationTimeCollector(Class.forName(operationType + "$Details"), outputFile));
             }
         }
 
@@ -126,24 +127,38 @@ public void close() throws IOException {
         }
     }
 
-    private static class BuildOperationCollector {
-        private final Class<?> detailsType;
+    private abstract static class BuildOperationCollector {
         private final File outputFile;
-        private final AtomicLong buildOperationTime = new AtomicLong(0);
+        private final AtomicReference<Double> data = new AtomicReference<>(0d);
 
-        public BuildOperationCollector(Class<?> detailsType, File outputFile) {
-            this.detailsType = detailsType;
+        public BuildOperationCollector(File outputFile) {
             this.outputFile = outputFile;
         }
 
-        public void collect(Object details, OperationFinishEvent operationFinishEvent) {
-            if (detailsType.isAssignableFrom(details.getClass())) {
-                buildOperationTime.addAndGet(operationFinishEvent.getEndTime() - operationFinishEvent.getStartTime());
-            }
+        public abstract void collect(Object details, OperationFinishEvent operationFinishEvent);
+
+        protected void accumulate(double delta) {
+            data.accumulateAndGet(delta, Double::sum);
         }
 
         public void write() throws IOException {
-            Files.write(outputFile.toPath(), String.valueOf(buildOperationTime.longValue()).getBytes(StandardCharsets.UTF_8));
+            Files.write(outputFile.toPath(), String.valueOf(data.get().doubleValue()).getBytes(StandardCharsets.UTF_8));
+        }
+    }
+
+    private static class BuildOperationTimeCollector extends BuildOperationCollector {
+        private final Class<?> detailsType;
+
+        public BuildOperationTimeCollector(Class<?> detailsType, File outputFile) {
+            super(outputFile);
+            this.detailsType = detailsType;
+        }
+
+        @Override
+        public void collect(Object details, OperationFinishEvent operationFinishEvent) {
+            if (detailsType.isAssignableFrom(details.getClass())) {
+                accumulate(operationFinishEvent.getEndTime() - operationFinishEvent.getStartTime());
+            }
         }
     }
 }