Microsoft defender for cloud signature updates

By “signature” are you referring to threats and vulnerabilities detection in MDC? If yes review articles provided as it states it takes up to 22 hours to be updated. 

• https://github.com/MicrosoftDocs/azure-docs/issues/94350
• https://jeffreyappel.nl/microsoft-defender-for-endpoint-series-define-the-av-baseline-part4a/