Ride the Lobster: RIDERS

Dr. Ken Looi, Team NZuni, held the Guinness World Record record for distance unicycling in 24 hours at 236.2 miles (378 km.) until…
Sam Wakeling, Team Smile, covered 453.6 km (281.85 miles) on a unicycle in a 24 hour period at Aberystwyth, Wales, United Kingdom, from 29 to 30 September 2007. Sam used the event to raise over £1500 for Christian Aid.

As of today, January 24, 2024, that record still stands.