I mean surely sometimes people have time-sensitive tasks to finish. And maybe they decide to let an update finish in a break. And they realize that it won't finish in time, so they do a hard reset. But then the rollback kicks in, which also takes an eternity.
Here's my experience with Windows 10's updating: Every now and then, when I shut the PC down for the night, it updates itself first. Sometimes it finishes up on bootup, delaying startup by a minute or so.
That's it.
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I've had this happen to me too. Boot up an old Windows 7/8/10 machine, tun updates, it takes an unusually long amount of time. It seems like Microsoft does a bad job testing cumulative updates, and they hang or something. I have my main PC running all the time, so I get updates when they're released. This process seems to be much faster, the longest update I saw recently was about 10 minutes.