The farthest distance covered on a water slide in 4 hours by a male is 36.7 km (22.8 miles), achieved by Peter Hecker (Germany), at Galaxy Erding in Erding, Germany on 18 November 2010 in celebration of Guinness World Records Day 2010.
The record took place on the longest inner-tube water slide Magic-Eye, which was ascertained on Guinness World Records Day 2010.
Please note: Comments below may relate to previous holders of this record.