World class race walkers can walk a marathon in less than three hours. At the 2012 Olympics the winner of the 20 km (12.75+ miles) walk won in one hour, 18 minutes and 46 seconds. In the 50 km (31.12+ miles) walk, the winner finished in 3 hours, 35 minutes and 59 seconds. I have watched it in person on a track and it quite amazing to see someone do a 6½ +/- minute mile for an extended period with one foot always touching the ground.
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'Integrity is what you do when no one is looking'
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