SAN FRANCISCO (CBS SF) – A San Francisco man has traveled a really long way to prove he can run a really long way.

Thirty-one-year old Tim Durbin is the only American to complete the World Marathon Challenge that started last Saturday and ended in Sydney, Australia Friday morning.

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The World Marathon Challenged confirmed that Durbin completed the final race in just under five hours, finishing 7th among the races on the final leg.

And later posted a photo of his completion medal

Prior to the Sydney run, Durbin completed races in Antarctica, Chile, Miami, Madrid, Morocco and Dubai. He undertook the journey to raise money for the V Foundation for cancer research.

Durbin averaged about 5 ½ hours over the first six 26.2-mile runs.

Durbin said in an email that the Morocco marathon was the toughest. It started less than 7 hours after he completed the race in Spain.

Shortly after Durbin completed the race, Marianna Zaikova became the first woman ever to complete the challenge.

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The other competitors are from Brazil, India, Great Britain, Hong Kong, France, Finland and Australia.