My wife grew up in Oklahoma City. Every year at the fair there was a contest called the B.O.-Geo, similar to Hands on a Hardbody, where 5 contestants had to sit inside a Geo Tracker. They were given set bathroom breaks, but that was it. They ate in the car, slept in the car, talked in the car, lost their minds in the car, and the last one "left sitting" in the Geo was the winner.
The fair was 2 weeks, and so was the contest (if it went that long). She said those who persevered on were in very haggard shape by the end. The winner was usually near insanity, and usually pondered if what they endured was actually worth the prize.