Nattland Backyard Ultra uses a 6.7 km loop on Nordre Nattlandsfjellet in Bergen, Hordaland, starting a new lap at the top of every hour. This is a backyard ultra: complete the loop within the hour, rest for the remaining time, and then start again when the next hour begins.
The format continues until one runner finishes a lap. The stated goal is twelve laps, or 80.4 km. Runners who finish quickly gain longer breaks. Those who are slower have less time to eat, change gear, or reset. Participants can join for any number of laps they wish.