> Obviously, less time spent is better, but what really matters is the timing... On Windows the upgrade is always inconvenient, because you have no way of controlling it.

True, very good point in favor of user control. Linux has the added benefit of teaching the discipline and foresight to understand that "Hey... maybe I shouldn't run sudo pacman -Syu and reboot until I have some time set aside". Though in recent years I've found Arch to be way more stable with very few updates causing major problems.