diff --git a/.changeset/late-tools-grow.md b/.changeset/late-tools-grow.md
new file mode 100644
index 00000000..cb8daf20
--- /dev/null
+++ b/.changeset/late-tools-grow.md
@@ -0,0 +1,5 @@
+---
+'@lightmill/react-experiment': major
+---
+
+Do not flush before completing a run, and do not require loggers to define a flush method.
diff --git a/packages/react-experiment/src/timeline.ts b/packages/react-experiment/src/timeline.ts
index e56f22b8..ca9f58a8 100644
--- a/packages/react-experiment/src/timeline.ts
+++ b/packages/react-experiment/src/timeline.ts
@@ -31,7 +31,6 @@ type TimelineAction<T> =
 export type Logger = {
   startRun(): Promise<void>;
   addLog(log: RegisteredLog): Promise<void>;
-  flush(): Promise<void>;
   completeRun(): Promise<void>;
   cancelRun?(): Promise<void>;
 };
@@ -117,7 +116,6 @@ export default function useManagedTimeline<Task extends BaseTask>(
       });
       if (hasEnded) return;
       dispatch({ type: 'all-tasks-completed' });
-      await logger?.flush();
       await logger?.completeRun();
       if (hasEnded) return;
       dispatch({ type: 'run-completed' });