Zero stops for me on 50-70 mile rides.

The Garmin records 'moving time' even if you do stop, but for all those folks that think they're as good as their moving time with all stops removed including that 5 minute water stop - you're fooling yourself. That rest stop is a big bonus and artificially inflates your moving time. Take 2 of them, even on a 4 hour ride, and your moving speed is a good 1.5mph faster than normal, if going hard which is a big deal.

For 70+mile rides, I do stop for nature/water break, but it's usually one stop.