Similar to Group Policy, Always Auto Reboot At Scheduled Time Minutes sets the timer to warn a signed-in user that a restart is going to occur.
For a detailed description of these registry keys, see Registry keys used to manage restart.
This method is not recommended, and should only be used when neither Group Policy or MDM are available.
Any settings configured through Registry may conflict with any existing configuration that uses any of the methods mentioned above.
To configure active hours max range through MDM, use Update/Active Hours Max Range.