As I've been adding distance to my rides this year, I've found that my average speed isn't really changing much, but the distance I'm able to go between stops has increased. On my first couple of rides this year I could only go about 5-7 miles before a rest. Last week I did 80 miles, stopping every 20 miles. This past Sunday I did 50 and only stopped once at the 25-mile mark. I know some of you ironmen do centuries without stopping, but what's a typical distance interval between stops for the rest of you?