I appreciate that sometimes it will be necessary to update my PC for security reasons. I further appreciate that applying those updates will sometimes require restarting my PC. And I even appreciate that some updates will take longer than others to apply.
What I don't appreciate is that you don't tell us beforehand when a 'restart' is expected to take a particularly long time, leading to my PC being out of action for an hour and three-quarters when I have better things to be doing than watching your largely-illusory count of the percentage completion.
And I really don't appreciate it when the counter gets to 100%, the PC restarts for the final time, I log in, and then have to wait another five minutes for a painfully slow "we're getting your PC ready" presentation. If you still have work to do, your update is not 100% complete.
(Even more galling still is that, as far as I can see, the net effect of the updates has been to cause my PC to run 10% slower than it did previously. Gee, thanks!)
Just an idea: maybe in future you should consider giving an estimate of how long a 'restart' is expected to take?
#55: "Pathfinder: The Thrushmoor Terror", by Tito Leati