Bob Costas is a liar.
OK That's a bit dramatic but he was wrong about the Mongolian marathon runner.
He said at the 1992 Olympics, Mongolia Pyambuu Tuul took 7 hours to finish the marathon.
The guy's name is Pyambuugiin Tuul, and he took 4 hours to finish, about 56 minutes longer than the next runner.
https://en.wikipedia.org/wiki/Athletics_at_the_1992_Summer_Olympics_%E2%80%93_Men%27s_marathon
He was way off.