I'll have to dig out the info from this season's series - I know on the 600k I was spending more time than usual!
I was setting my watch to beep every 15 min. for a food / drink reminder.
(I usually end up riding alone - so this doesn't annoy anyone)
It's also a good guage when I'm in a control - if I hear it beep once I know I've gotten out in under 30 minutes. If it goes twice I know I'm dragging!
I try to keep my stops to 15 min or less. This seemed (from memory) to work on the 2,3, and most of the 400k.
So long. Been nice knowing you BF.... to all the friends I've made here and in real life... its been great. But this place needs an enema.