This sounds a lot like the last-person-standing format that is becoming more popular. The most well known is probably Big's Backyard Ultra: https://trailrunne

This sounds a lot like the last-person-standing format that is becoming more popular. The most well known is probably Big's Backyard Ultra: https://trailrunnermag.com/races/bigs-backyard-ultra-gets-bigger-and-bigger.html https://trailrunnermag.com/races/bigs-backyard-ultra-gets-bi... > The format is simple: Runners must complete a 4.16667-mile loop every hour until only one hardy soul is left. Whatever time they bank before the next hour begins is theirs. So it’s not a race of speed but rather a war of attrition where all but the winner DNF. Last year, a duel between Guillaume Calmettes and Harvey Lewis ended with Calmettes running 245.835 miles in 59 hours. The feat drew considerable attention for the race and attracted a highly competitive field for 2018.