Hi,
Thank you for posting in Microsoft Q&A forum.
In the update ring policy we can't set the amount of time of restart notification to end user. We can use the CSP policy AutoRestartNotificationSchedule to have a try. This policy will specify the amount of time (30,60,120 minutes etc.) prior to a scheduled restart to notify the user. Refer to:
Thanks for your time. Have a nice day!
Best regards,
Simon
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