I guess for me, completing a century means very little if all I'm doing is attempting to pedal through. Most of my centuries involve stopping because there's something interesting to see/check-out. I also stop and make calls to let my wife know I'm okay or to tell her about something interesting that just happened. And while I'll drink while riding, I actually prefer to stop to eat... even if it's an energy bar. I like to find some place serene so I can contemplate my surroundings while snacking.