@Sagi Shkedy I am going to post the answer from Product that is posted here.
"The frequency of rotation can change based on our compliance requirements, so we do not want to make statements here that need frequent updates. The Trust Center link provides the audit reports that check on key rotation policies and Microsoft's compliance with them. The internal secret store is not customer facing, and we do not disclose these details for security reasons."
Regards
Navtej S