They want more Dannevirke riders to take up the challenge with them, however, so they are revving up the Dannevirke cycle club to get people interested.
"The lack of sleep was a killer," Mitchell admitted.
The sleep factor also saw Jason fall asleep in the dark.
"In a 30-hour period we had just one and a half hours' sleep," he said.
"At night we had four hours when we couldn't see what we were riding over or through and the second time around the lake was tough mentally. We had to work together.
"Mitch swore at me when I went too fast. Our motto was to stick together. If one of us hit the wall, the other had to carry them through. But we had a great support team and if it wasn't for them we couldn't have achieved what we did.
"They were a bit like the 12th man in a cricket match."
To get to the start line in Taupo took three months of intense training.
"In September we cracked into it big time and Colin [Anderson] was a big help," Jason said.
"We would leave Mitchell's house at 3am for a training ride and then be at the spin class at Activate Gym at 6am, before heading off to work."
Their training regime was also a big sacrifice for their families, Mitchell said.
"At the weekend we'd leave home at 7.30am and not get back until 5pm, but it was all worth it.
"Mind you, the best part of the 320km was riding over the finish line."
And while the two-lap ride was a massive challenge the guys admit that ultimately they'd like to tackle the four-lap ride.
"But at the moment, I'm just knackered," Jason said.
"I loved the challenge, but it was the pure mongrel in me which got me through."
For Mitchell, his personal motivation was the knowledge his mother had come through a stroke.
"At the top of a hill Jason would say, 'come on Mitch, you are doing it for your mum'."
• The Dannevirke Cycling Club is being revived. Members will meet between 5pm and 5.15 every Tuesday in the Activate Gym carpark in Allardice St, ready to take off at 5.30pm.