50 minutes.
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one hour.
1.6 hours
At a brisk pace (4 miles per hour) it would take 1 hour and 15 minutes.
In 1 hour (at two miles per hour) you would have walked two miles. Therefore, half a mile would take 15 minutes.
People walk at different speeds, averaging about 3 miles per hour. On that basis, it could take 13 hours and 18 minutes to walk 39.9 miles.