I just remembered this:
Joe Nation wrote:"Huh," said a friend of mine, "five hours? That's the same time it takes me to play a round of golf with a little stopover in the clubhouse at the end."
Joe(Why didn't I think of that?)Nation
So if he expects to be out there for about 5 hours, and he's run for 3 hours and 41 minutes so far, and he has about 8 miles to go, at about 12 minutes per mile he has 96 minutes (1 hour 26 minutes) left, and 3:41:00 + 1:36:00 = 5:17:00!!
That looks good...