How about the moto riders in the Paris Dakar? They get pounded in desert conditions for as much as ten hours a day while navigating, fix their own breakdowns during the day, sleep in tents at night(If they don't spend all night helping to repair their ride) eat mre level food and it goes on for a couple of weeks.
Stage racing is tough(Far tougher than I could do) but they usually don't spend more than five hours on the bike, are supported by their team of other riders(and the pack as a whole) have a squad of guys following them in a car to take care of any problem, get a massage and a tailored meal after the days ride then go to a nice hotel to relax (where they will probably get on rollers for a while)