I find it really frustrating that I can't postpone the update, finish doing what I was doing when it interrupted me, and then start the update. I have to wait until it decides that it's ready again. There seems to be some sort of monitor that checks how inconvenient it would be for me to do the update now. If the inconvenience meter hits a certain threshold, then it asks if I'd like to do the update now. I think that every time you postpone the update, it increases that threshold. Now, I just let it interrupt me because I've found that if I don't, it'll find a time that's even less convenient to ask again. "I see that you're in the middle of a text conversation with three people. Want to update now? No? Ok, well now I see that you're lost and you just asked Google Maps to help you get home. Would you like to do the update now? No? Ok, well I see now that you've dialed 9-1-1 and you're about to press send. Would you like to do the update now?"