Just having interruptible updates and an average time to completion would make me hate MS Windows a little less. Like how hard is it too say "your computer needs updating, it takes 20 minutes on average for other users: continue, snooze, or schedule", then have "complete update later" button.

And do their damnedest to get rid of the half-hour wait on reboot whilst it does unknown evil in the background with no indications of action or time to completion ... yes, I've been burnt!

Google Play already has the option for manual updates. It will prompt that an update is available and you can press the button to install.

The problem is that Windows is designed for the lowest knowledge user, who would never manually prompt for updates because they either think them useless, don't know they are there, or have a "don't fix it if it works" mentality.