From Oregon, to Virginia, through pit bulls in KY, self supported, in 19 days.
A couple of times in Montana I crossed paths with guys (and one gal) riding the Great Divide MTB Route race. The crazy thing was that someone had already won after only 13 days of riding. The finish is at Antelope Wells, NM, or the border with Mexico. Still, I don't think I could ever do it even at a snail's pace.