To perform at our best, ultraracers need CREW - a team of people who take care of, well, pretty much everything but pedalling the bikes: Operating the pace vehicle(s), following the racers around, making sure that they eat and drink (by persuasion, trickery, or force as the situation warrants), fixing bikes that break, and generally keeping the wheels pointed forward and rolling toward the finish line. Occasionally, good pirate skills (eg pillaging, mayhem, or mutiny) are helpful.
Many - but my no means all - crew are endurance athletes themselves. We take turns helping each other through epic s$*t. Good crew are incredibly hard to find. We've been incredibly lucky!