It depends upon how fast you drive: time = distance / speed
At 100 km/h it would take 820 km / 100 km/h = 8.2 hour (8 hours 12 minutes).
At slower speeds it would take longer, at faster speeds less.
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Rounding the number 820 to the nearest hundred would bring it to 800.
820
time = distance divided by speed = 820/140 = 5.86 hours; 1 knot is one NM
820
820