depends on how fast you walk each mile. say it takes 15 for the first five. after that your pace might change so it would probably take 5 + hours
The average speed of someone walking is 3 mph (wikipedia). So, if you estimate that someone walks 3 miles every hour, it would take nearly 7 hours, or 400 minutes (approximately).
I plugged in this formula to get the minutes...
(20 total miles/3 mph) x 60 min = 400 minutes.
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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.