It depends on how fast you can walk.
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1 knot - 1.2 mph, 1.2 * 16 = 19.20, 3500 miles/19.20 = 182.30 hours/24 hours in the day = 7.60 days.
How long does it take to walk 0.21 miles
long would it take to go 6600 miles by train?
It would take about three days.
It would take 10 seconds.