Windows 11 version 25H2 introduces a new Group Policy setting, Configure maintenance windows for automatic updates, that lets you define precise time windows for downloading, installing, and restarting after updates. The policy ships with version 3.0 of the ADMX administrative templates and is currently available only in Windows 11 Insider Preview builds. It takes priority over several existing update-related policies, but the interaction rules are only partially documented.
Source : 4sysops
