Easy way is GWX Control Panel http://www.softpedia.com/get/System/System-Miscellaneous/GWX-Stopper.shtml
30 days to revert back is not quite correct. Use Windows Rollback Utility.
http://www.thewindowsclub.com/windows-10-rollback-utility.
I use Startisback ever since 2015 which is just...