An Auckland man has had an 'up-and-down' day trying to break the world record for most bungee jumps in 24 hours.

Mike Heard's been leaping off Auckland's Harbour Bridge all day, raising money for the Mental Health Foundation.

He's trying to finish 800 before 7am tomorrow- but he's slightly behind schedule.

AJ Hackett Sales Manager Leo Medina is helping out, and he says the fundraising is going well- they're at over $5000 so far and aiming for $10,000.

LISTEN ABOVE