Relatedly, see Big's Backyard Ultra[0]: runners run a 4-mile loop, on the hour, every hour, 24 hours a day, until only one runner completes a loop that nobody else does. In 2011, when it started, the winner did 18 laps. In 2023, the winner completed 108 laps!

[0]: https://en.wikipedia.org/wiki/Big%27s_Backyard_Ultra