How long does it take to recover from swimming 3.8km, cycling 180km and then running a full marathon?
Former Magpies captain Michael Johnson is hoping eight days will be enough time to catch his breath, so he can compete in the annual Tremains Triathlon next Sunday.
First, he'll debut in Ironman New Zealand in Taupo this Saturday.
He is usually a spectator at the event and this is the first time he plans to go the full distance, after doing the half in December last year.
"It's a big day at the office," he joked of the challenge, widely considered one of the most difficult one-day sporting events in the world.