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For runners who crave more of a challenge and aren't content running just a 26.22 mile marathon, there are things called ultramarathons that can go on for longer. As many as 70,000 runners a year participate in ultramarathons of 50 and 100 miles, 50 and 100 kilometers as well as timed and multi-day runs of 6, 12, 24 and 48 hours or even runs that last six days. Most countries in the world have some sort of ultramarathon going on.