Few minutes saving for me is more than 20 minutes. Once per month is true if upgrading once per month, but I am doing upgrading at least twice a week. And if some plugin has failed and must do several tries (because of course we are working with live instances 
) then that long downtime is just pain.
There is no details in the announcements every new release to follow. Mcdanlj may have, but he isn’t an ordinary sysadmin but works on much higher level.