[darkwizard42]

Dang, that would be SO impressive... <1000 calories an hour would mean he is running SUPER efficiently from a body perspective, but of course, with the right hydration, nutrition, and temperature it is all possible to burn less calories.

[mikestew]

Whether you walk it or run it, a mile is about 100 calories. So, give or take, ~20,000 calories. Divide by 3500 calories/lb. and he burned five pounds of fat he probably didn't have to spare. But not so fast, he was also consuming calories along the way, and consuming a lot.

So calculating the net burn would be quite difficult. But the gross burn was probably about five pounds/2.25Kg.

[Majestic121]

I don't know about that, it's probably not super precise but an hour running is 600-700 kcal burned, reported by Garmin Connect