kbarch

Good Lord - I could never do that. Even without training, I'm sure I'd complete one in less than five hours, if only because I wanted to get it over with! Same reason I go fast uphill - to get it over with.
Which gets me to a psychological reason why cyclists aren't as trim as runners: because you can enjoy a bike ride without really working, and without it ever seeming like work. When I did run, I did well, but it always ALWAYS seemed like work, and it always felt like something I wanted to get over with. Most of the time I ran fast because I wanted to finish and be done. With cycling, it's the other way around. I don't go fast most of the time because I don't want to be done.