540/4 = 132.5 hours
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20/4 = 5 hours
11/3 = [3 and 2/3] miles per hour.
It depends on how fast you can walk, and how many hours you can do without a rest, how long you rest.
The average person could run 9 to 12 miles in three hours. Most people could not run for three hours, so many would walk portions of this challenge.
I walk 4 miles/hour...x 2= 8 miles...