The process of undoing the changes that you have done in your computer usually takes 5-30 minutes depending on the speed of the system and the size of the updates; slow systems and massive updates are known to take time.
“Undoing changes made to your computer” (like after an update) usually takes 5–30 minutes, but it can take longer (up to an hour) depending on your system speed and the size of the update. Avoid turning off your PC during this process.