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That means running an average of 13.1 mph for two hours! A 4.35 minute mile for 26.2 miles.
I couldn't find a reliable source for an average person's top speed, but it seems to be around 17 mph. According to Wikipedia, Usain Bolt has the fastest running speed recorded at 27.79 mph. If he could keep that up, he could do a marathon in 56.6 minutes. No problem.