Leapfrogging: 8 hours: Distance: 17 miles 342 yards. On July 19, 1974, Mike Barwell and Wally Adams from East Yorkshire (United Kingdom), leapfrogged a distance of 17 miles 342 yards (27.4 km) in eight hours, averaging one leap every five yards, along the disused railway line between Sutton and Hornsea, Humberside (United Kingdom).