Nev has 4 Guinness World Records for building the largest surfboards, and having the most surfers riding a wave on one surfboard.

2005 / 40ft long with 47 surfers at Snapper Rocks, Queensland 

2015 / 42ft long with 64 surfers at Huntington Beach California.

Google Nev Hyman / Worlds Biggest Surfboard for a bit of a laugh