"A bit tongue in cheek someone said why don't you try and do it all and I though it could be a go-er," he said.
His previous longest distance run is 150km.
Mr Townley said there was "a bit of uncertainty" getting the logistics sorted. Because there will be no aid stations for the first two legs he's completing solo, Mr Townley will be putting out buckets of food beforehand to keep him going. "They'll be chocka of food and some warm clothes."
He'll also be having mates run with him along the way.
"It's just a mental game."
So how does he plan to keep going?
"Singing songs to myself, talking bullsh*t. Once you start thinking about how sore your body is it is pretty much game over."
As for getting three medals - Mr Townley said that's not what it was about. "It's seeing where my limits are."