Here you go, 60 seconds and you're done:
I've never known quite what to think of your idea. I've known plenty of people that were faster than me, and a lot of those people never rode over 100k or so, either. But I've always sort of assumed that if they'd just slow down some, they could ride a lot longer, too. I know I COULD go hammer all out for 10 miles and be spent, so I assume that if other people took it easy, they could just ride all day, too.