By default, Microsoft allows users ten days to uninstall a new Windows 10 feature update and roll back to a previous version of the operating system. Microsoft sets the OS uninstall window setting to ten days, which the amount of time you have to uninstall the new update. The Deployment Image Servicing and Management tool (DISM) command-line tool (disM) can be used to give users more time to uninstall new feature updates. For example, if you wanted to set the OS Uninstall window to 59 days, you would enter the command DISM /Online /Set-OSUninstallWindow:59 as shown below.
Source: https://www.bleepingcomputer.com/news/microsoft/how-to-get-more-time-to-uninstall-windows-10-feature-updates/