During this time, you are usually forced to stare at a blue loading screen for an unknown period or occupy yourself with other things.
If you often update Windows, then you have probably encountered the unnecessarily long installation processes. The latter is usually on the safer side but also risks issues such as buggy updates. The former misses crucial updates responsible for fixing bugs in the operating system. Some hate the updates and don’t even download them, while others install every released update. Users have varying opinions about Windows 10 updates.