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It depends on the speed at which you walk.
How long does it take to walk 0.21 miles
It depends on how fast you can walk.
4.2 miles walking is 4.2 miles long., but if you look up "how fast does a human walk" you can do the math to get how long it will take to walk 4.2 miles: 4.2mi/2.5mph=1.68 hrs or 100.8 mins ballpark, depending on how fast you walk. see the provided link.
one hour.