Paris–Brest–Paris (PBP) is a 1200km (755 mile) bicycle ride from Paris to Brest and back to Paris. It is the oldest bicycling event still regularly run. The goal is to make it within 90 hours, but with no competition. This is held every four years.
As in all brevet events, there is emphasis on self-sufficiency. Riders buy supplies anywhere along the course, but support by motorized vehicles is prohibited except at checkpoints. There is a 90-hour limit and the clock runs continuously. Many riders sleep as little as possible, sometimes catching a few minutes beside the road before continuing.