Rules should be updated to have time end when you go in the door after killing the fountain.

The goal is any%, not defeat the fountain. The game is not over and the credits do not roll until you go in the door.

Edit: (read post below (don't change timing yet))

Actually, even though I've been pretty sure of this up until now, I'm having second thoughts about this timing after finding out that you can quit to menu after the last hit on the fountain, and that will let you start new game+. Leave it as it is for now until I think about it some more. Feel free to send any of your thoughts on this topic my way

ahh didn't think about that. i took the time from tteraj42's run at AGDQ 2015. they stopped the timer at the fountain kill