This discussion comes up every once in a while when I do centuries, etc. as some people won't count it as a "real" century if you are off the bike longer than it takes to pocket a snack, fill your water bottle, and use the restroom. One guy I've met on a couple of organized rides refuses to use the rest stops. He carries three water bottles with him and gets frustrated if he has to make a nature call at a grove of trees or corn field. His goal is to complete the 100 miles without putting a foot down. I can't decide if he is hardcore or nuts.