Less time than it takes to walk 80
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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.
How long does it take to walk 0.21 miles
It depends on the speed at which you walk.
It depends on how fast you can walk.
45 hours.