Merge pull request #268801 from shanhix1/patch-2

Added 20 min latency expectation

Author: prmerger-automator[bot]

articles/governance/policy/concepts/event-overview.md

@@ -22,6 +22,8 @@ To learn more, see [Event Grid message delivery and retry](../../../event-grid/d
 > Azure Policy state change events are sent to Event Grid after an
 > [evaluation trigger](../how-to/get-compliance-data.md#evaluation-triggers) finishes resource
 > evaluation.
+> 
+> Event Grid notifications for resource compliance state changes can take up to 20 minutes.
 
 ## Event Grid Benefits
 Event Grid has a few benefits for customers and services in the Azure ecosystem: