This past winter I was doing 20 mile rides 4 to 5 times a week. I just turned 66 about a week ago. 20 miles up here in NH is more work due to the hills which Florida didn't have where I was riding. I am in the process of getting back to at least 4 days a week of riding if not more. On my rides that are 20 or over I want a break, I don't eat or drink when riding so I prefer a 10 minute break and then hit the road again. My main reason for riding is I enjoy riding.