I prefer to average something much less than 100 miles days, but... I think the comments that all you will have time to do is ride are not true. At a very modest pace of 12.5 mph, 100 miles is only 8 hours of riding. So figure 8 hours of sleep, 8 hours of riding, 1 hour of making and breaking camp, and 2 hours of cooking and/or eating. That still leaves 5 hours (more for faster riders) for stops, checking out the town you stay in, or hanging out in camp.

I know that on our longest day on the TA we did 115 miles and still had time to take a few long breaks to hang out and chat with the locals, take a very long lunch at an all you can eat Italian restaurant, do our laundry, and spend a very pleasant evening with our gracious hosts.

100 miles on an everyday basis might be a bit of a drain on your energy levels, but you won't need to ride all day to do 100 miles. Still it is more pleasant for most of us to do more like 60-80 mile days including rest days.