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A 24-hour run is a form of ultramarathon, in which a competitor runs as far as they can in 24 hours. They are typically held on 1- to 2-mile loops or occasionally 400-meter tracks.

Top runners will often run 200 kilometres (124 mi) or more, depending on conditions, and the best can go beyond 270 kilometres (168 mi). Some participants will have a crew to help them, but others just set up a camp with all the gear and supplies they need near the starting area to access each loop. Often 24-hour events are combined with 6-, 12-, and 48-hour events. 24-hour runs have also been held in relay formats, with runners completing a mile each in succession for 24 hours. Often these events are not internationally sanctioned, and are more for charitable purposes.^[1]

The world records for the event on all surfaces are 270.363 km (167.996 miles) for women, set by Miho Nakata of Japan in 2023,^[2]^[3] and 319.614 km (198.598 miles) for men, set by Aleksandr Sorokin of Lithuania in 2022.^[4]

Competitions

The first international championship was held February 3–4, 1990 in Milton Keynes, England.^[5] A full continental championship was formed in 1992 as the IAU 24 Hour European Championships.^[6]

The IAU 24 Hour World Championship is the pinnacle of competition in the 24-hour run. The first IAU Individual Track Championships were held in San Giovanni Lupatoto, Verona, Italy on 22–23 September 2001.^[7]

The German website DUV lists 160 24-hour races that were scheduled for 2012, a figure that has doubled over the last 10 years. The longest running 24-hour race is the Self-Transcendence 24 Hour Race Ottawa, Canada which began in 1981.^[8]