2 days
150 miles from Marathon to Sparta and going back to Athens.
How long does it take to walk 0.21 miles
The Brooklyn bridge is 1.13 miles long. If you want to walk it to Brooklyn and then back, its 2.26 miles long.
Many days, if you are walking.
Many hours, when walking.
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.
It's about 62 miles (100 km), and about an hour and twenty minutes.
12 miles
2 days
1 hour and 12 minutes
It all depends at how fast you are walking. a brisk walk is 4.5mph. Therefore it would take about 29.37hours. But like i said, depends how fast you are walking...!
It could take 20 minutes or less if you are walking.