Totally doable, where could I get in on some of the action that bets on the rider? I'm 45, I had smoked (2 packs a day) and my only physical activity was IDPS and some 3 gun when I started riding and was doing 40 miles in a day, after work, in near 100 degree temperate 3 or 4 weeks after I started riding. You say in very good shape (if it is D. Bilzerian) he looks like he spends time in the gym which might or might not help on a bike 16-20 hours a day but if he's used to grinding it out playing cash games I'd say he has the metal toughness to push his body through and go straight start to finish if need be. I think I could do it, do have $600 K to wager but if someone just wants to put up some cash I'd give it a go.