It doesn't matter whether it is hours or one minute, it's unacceptable. A sibling comment here describes how a Windows update started in the middle of a present

It doesn't matter whether it is hours or one minute, it's unacceptable. A sibling comment here describes how a Windows update started in the middle of a presentation someone was giving, which indicates quite clearly that Windows Updates take productive time away - not just of the user of the computer, but those who were listening also. Again, computers are our servants, not our managers.