When I was 15 I took a Greyhound from St. Louis to Portland. It was almost 4 days I think, and it was, still, the worst consecutive 4 days of my life. Between all of the gnarly passengers, and their collective BO, the rest stops / food in the worst neighborhoods you pass on your way there, to the inevitable breakdowns and, as above occassional gruesome murder / canabalism....I can't urge you enough to just save the extra cash and drive, or take a train or something.