From 11f753fddff57dc715020c50c6350b67815d31ed Mon Sep 17 00:00:00 2001
From: Lukas Stracke <lukas.stracke@sentry.io>
Date: Wed, 7 Jan 2026 15:16:05 +0100
Subject: [PATCH] ref(core): Strengthen `browserPerformanceTimeOrigin`
 reliability check

---
 packages/core/src/utils/time.ts           | 3 +--
 packages/core/test/lib/utils/time.test.ts | 2 +-
 2 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/packages/core/src/utils/time.ts b/packages/core/src/utils/time.ts
index b46c569433d0..ecaca1ea9e9b 100644
--- a/packages/core/src/utils/time.ts
+++ b/packages/core/src/utils/time.ts
@@ -91,8 +91,7 @@ function getBrowserTimeOrigin(): number | undefined {
     return undefined;
   }
 
-  // TOOD: We should probably set a much tighter threshold here as skew can already happen within just a few minutes.
-  const threshold = 3_600_000; // 1 hour in milliseconds
+  const threshold = 300_000; // 5 minutes in milliseconds
   const performanceNow = performance.now();
   const dateNow = Date.now();
 
diff --git a/packages/core/test/lib/utils/time.test.ts b/packages/core/test/lib/utils/time.test.ts
index 7f3f7f2d6c19..a1d537df5862 100644
--- a/packages/core/test/lib/utils/time.test.ts
+++ b/packages/core/test/lib/utils/time.test.ts
@@ -7,7 +7,7 @@ async function getFreshPerformanceTimeOrigin() {
   return timeModule.browserPerformanceTimeOrigin();
 }
 
-const RELIABLE_THRESHOLD_MS = 3_600_000;
+const RELIABLE_THRESHOLD_MS = 300_000;
 
 describe('browserPerformanceTimeOrigin', () => {
   it('returns `performance.timeOrigin` if it is available and reliable', async () => {