An Auckland daredevil is on a mission to crack a world record for the most bungy jumps in 24 hours - all while fundraising for mental health causes.

Mike Heard will start his attempt at 7pm on Tuesday from the Auckland Harbour Bridge. His "conservative goal" is 200 jumps in the 24 hours following, and he said was thriving on the pressure.

"I'm wanting to give the record a solid nudge and bring it home.

"I enjoy putting myself outside my comfort zone. I've always done it."

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Heard has previously set two Guinness World Records for bungy jumping - the first in 2008 when he jumped 103 times in 24 hours from the Harbour Bridge and then again in 2014 when he jumped 80 times in 60 minutes.

His 24-hour record was beaten in 2014 and is currently held by Colin Phillips, who jumped 151 times in 24 hours in Dubai.

Heard is confident he can beat his old record as he is now able to use a shorter rope, around 5-10m, meaning he doesn't have to get dunked in the water each time.

"[For the first record] my cord was 20m; I got wet and very, very cold."

Heard said there are no proven health issues that result from too much bungy jumping, but he will have a medical team on standby.

The 35-year-old, who works in the technology sector, is hoping to raise more than $50,000 for the Mental Health Foundation. He said he wanted to do it for a good cause and mental health felt right considering New Zealand's problems with suicide.

He had tried to support friends and family who struggled with mental health issues in the past.

"I did a pretty s*** job. I didn't understand it, I thought if they were depressed or anxious they needed to go do something they enjoy. But it's not like that.

"I want to highlight how people can be there for friends and family as a support person... You've got to bounce back."

Heard said he was pretty nervous in the lead-up to the record attempt as he predicted some "grim moments" bungy jumping through the night.

But with all that experience under his belt, he had some advice for first-timers - always go for a double jump.

Mike Heard bunny jumps from the Auckland Harbour Bridge. Photo / Michael Craig
Mike Heard bunny jumps from the Auckland Harbour Bridge. Photo / Michael Craig

"The first time you bungy you're scared s***less, you feel uneasy. It's like the first time you breathe underwater. It messes with you a little bit.

"If you're going to do your first one, do a second one so you know what's coming and you can start to enjoy the feeling you get from it.

"For me doing it over and over, you don't get that adrenaline rush. It's more like swinging on a swing. You know what's coming, you know what the bounce is going to be like... It'll be boring."

Heard is also a keen skydiver, rock climber, scuba diver and has his paragliding licence.

Mental Health Foundation spokesman Shaun Robinson said the money raised would go towards campaigns and services covering the "A-Z of mental health and wellbeing" such as suicide prevention.

"We think it's fantastic that Mike wants to support changes in mental health through his bungy record-breaking feat. We use the idea of bouncing back from adversity as an analogy for mental health resilience, and the bungy is a good image to represent that."

Go to the Mental Health Foundation or text BUNGY to 2446 to make a $3 donation.