They update on two Tuesdays a month, and have done that at least since XP. Even with the most reboot-keen settings, the update doesn't happen until the time of day you're least likely to be using the machine based on when you typically do it. It tells you when that time will be and gives you several hours of notice with a popup with the option to delay. Depending on the variant of Windows you're using, you have settings to delay a forced reboot for up to a week (Home), a month (Pro) or forever (Enterprise). Obviously, that's not enough to make sure no one ever gets updates forced on them when they don't want them, and it would be nice if there was a way to distinguish users who know what they're doing from users who don't so people who do could be given more power to control if and when they install updates, but it is enough to ensure that checking the equipment before you use it is enough, potentially two weeks in advance.