There are people finishing then but they're the turbo slow walkers. I think 80 walked, took an extended break, cried for 5 miles with a swollen testicle and finished in just over 3. The one year I didn't train and walked half of it I still finished under 3. 4+ hour 1/2 is not an easy task. If he did in fact do that I guess good for him because he's probably a big boy.