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I Want to Run a Marathon

Not gonna happen. But my daughter's SO is running his second 100 mile (not kilometer) race this weekend.

I was there for the first one and when he came across the finish line, he looked tired, but not as tired as I expected.

As I recall, he did it in about 17 hours. The most elite runners can do it in 12 hours, the least in 48 hours. An article by a man who has done it said his fitness monitor reported he'd used 11,000 calories.
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SW-User
Yikes. I do marathons but 100 miles is a whole different deal. That sounds about right on the calories.
They run ... for 17 hours more or less. Brief stops for hydration and food ... how is that even humanly possible?@SW-User