Especially for those distance-oriented (AKA the "10K is too short" in college crowd).
A discussion that came up on the run recently - could competitive marathon training (we'll say 70-90 MPW with a 20-24 mile long run) be sufficient to "race" a 100K? We'll assume flat, so no mountain/trail/technical running element to it.
Could a marathoner complete 62+ miles? Competitively?