I'll note, doing a little math in my head, I figure over a muddy road I might be able to sustain 20 minutes miles, so it'd be a 12 hour walk, figure with fatigue, 30 minute miles and push that up to 18 hours. 18 hours and you're talking seriously unpleasant and the need to have light/moon (maybe stars) or bivouac.

Point being, a really bad situation. I would say in a situation where I wasn't following a road, 36 miles through forest, I probably wouldn't make it!