Fourteen years ago, I hosted a "trail runner" who got stranded in the Grand Canyon. I was backpacking for four days. This fool tried to cross the canyon twice in one day. That's forty one miles. He came up eight miles short at dusk at the campground.
He was a recent retiree who hiked in the mountains of Utah every day to prepare.
I put him up in my tent since I had room. Others brought him food, clothes and a mattress to sleep on. Then he had the bad taste to start whining about the President when I was trying to fall asleep.