diff --git a/test/isolation/isolation.test.ts b/test/isolation/isolation.test.ts
index 946d71682c..39a4f5ba89 100644
--- a/test/isolation/isolation.test.ts
+++ b/test/isolation/isolation.test.ts
@@ -67,9 +67,19 @@ if (!databaseUrl) {
   await prepareDatabase(databaseUrl);
   const hub = await bootIsolationHub(databaseUrl);
   const app: AppLike = hub.app;
+  // `hub.shutdown()` stops the sidecar then the hub in sequence
+  // (`test/isolation/setup.ts`), and each `stop()` (`scripts/e2e/
+  // harness.ts`) gives its process up to 5s to exit on SIGTERM before
+  // escalating to SIGKILL — so a graceful-but-slow exit on either
+  // process alone can approach Bun's 5000ms default hook timeout, and
+  // two of them in sequence can exceed it outright. CL-7462: this hook
+  // timed out at ~5001ms in CI once boot wiring grew (workflow
+  // allocation/dispatch initialization, extra reconciliation queries),
+  // pushing shutdown latency on CI's shared runners past the default
+  // margin even though nothing was actually hung.
   afterAll(async () => {
     await hub.shutdown();
-  });
+  }, 20_000);
 
   // Unique suffix so the suite can rerun against a database that
   // already holds rows from a previous run.