The 31-year-old Brit crossed the finish line at Bondi Beach, making his massive run a new Guinness World Record.

“What’s up!?” he shouted to the hundreds of runners behind him who turned out to run the last five and 10 kilometres with him.

William Goodge ran from Cottesloe Beach in Western Australia to Bondi Beach in Sydney. Source: AAP / PR Image / William Goodge

“It’s obviously been quite the journey … we start before the sun comes up and finish when the sun’s gone down,” he previously told AAP.

Throughout the run, Mr Goodge has raised money for the Cancer Council of Australia in honour of his mother Amanda.

“I had trouble sleeping through the night, experiencing intense pain in my bones and areas like my hip flexors. Mentally, I was restless, twisting and turning, and even experiencing slight hallucinations, which was far from enjoyable.”