probably 9 and a 1/2 hours
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439 knots=505.192178 miles per hour
45 hours.
4 hours obviously.
If you mean that travelling at 26.6 miles per hour, how long you would travel in 4 hours, you would travel 106.4 miles in 4 hours.
1,760 yards = 1 mile 439 yards = 0.2494 mile (rounded) 440 yards = 1/4 mile, exactly