Wow! I backpacked that route about 20 years ago, and spent 5 days hiking the distance! And they were long days of walking, too! Some days there were multiple 1000' passes to climb and descend. It's really remote back in there.
By the time the runners got to Paiute Meadow, they were 2/3 the way through. Too bad they didn't try it in July when it was dry.