At a brisk pace (4 miles per hour) it would take 1 hour and 15 minutes.
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about an hour. depending on how fast or slow your going
(3.5)/(2.5) = 35/25 = 7/5 = 1 and 2/5 hours
Around 5 centuries, so I would not bother starting.
20/4 = 5 hours
It depends on the speed at which you walk.