The average walking speed for a healthy adult, not carrying additional weight on a level surface is approx 3.1 mph. If that rate could be maintained, it would take nearly 22 hours. However, that assumes 22 hours without rest, comfort breaks etc.
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How long does it take to walk 0.21 miles
It depends on how fast you can walk.
Roughly 13 minutes.
if you walk 4 miles an hour how long would it take you to walk a mile
It depends on how fast you can walk, and how many hours you can do without a rest, how long you rest.