As the event grew in popularity, organisers decided to model it after the Royal Ascot horse races in England, complete with outrageous outfits and hats.

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It might take a week, but in the virtual races, the first one to complete the total distance wins.

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"Most 50 mile races typically have 12, 13, 14-hour time cutoffs, " said Posner, 50, who will complete his 45th marathon-or-longer distance when he takes to the trails on Saturday.

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Outhouse races, held in towns and cities across the western US, let teams compete in their own portable potties, complete with four sides, a roof, a toilet seat and even a roll of toilet paper.

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