diff --git a/docs/architecture/mailserver.md b/docs/architecture/mailserver.md
index 21b2f957..0026b932 100644
--- a/docs/architecture/mailserver.md
+++ b/docs/architecture/mailserver.md
@@ -231,7 +231,7 @@ Push secrets (`BREVO_API_KEY`, `EMAIL_MONITOR_IMAP_PASSWORD`) come from External
 |-------|-----------|----------|
 | MailServerDown | No replicas for 5m | warning |
 | EmailRoundtripFailing | Probe failing for 30m | warning |
-| EmailRoundtripStale | No success in >40m | warning |
+| EmailRoundtripStale | No success in >80m (60m threshold + for:20m) | warning |
 | EmailRoundtripNeverRun | Metric absent for 40m | warning |
 
 ### Uptime Kuma Monitors
diff --git a/docs/architecture/monitoring.md b/docs/architecture/monitoring.md
index 0de2a219..5fa3bbba 100644
--- a/docs/architecture/monitoring.md
+++ b/docs/architecture/monitoring.md
@@ -158,7 +158,7 @@ spec:
 
 #### Email Monitoring Alerts
 - **EmailRoundtripFailing**: E2E email probe returning failure for >30m
-- **EmailRoundtripStale**: No successful email round-trip in >40m
+- **EmailRoundtripStale**: No successful email round-trip in >80m (60m threshold + for:20m)
 - **EmailRoundtripNeverRun**: Email probe has never reported (40m)
 
 #### Registry Integrity Alerts