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I learned to sail in a 7-foot long sailboat that regularly achieved 20 knots.
It takes a bit over 3 hours to sail 19 miles at 6 knots
4.7 days at 19.5 knots
That all depends on the type of boat that you are using.
It takes (58)/(your speed in knots) hours.
The Strait of Gibraltar (36 miles long)
about 7 days in a favorable wind, since the ship would sail at 4-6 knots
This depends on the speed of the vessel over the distance. For instance if assume the vessels speed is 5 knots ( 5 nautical miles an hour) Apply the formula Speed=Distance/Time, With a bit of rearranging Time=Distance/Speed, Therefore it would take 35 hours to sail 175 miles at 5 knots.
The distance is 6665 nautical miles. 27.8 days at sea, speed of 10 knots
Well, a knot is 1 nautical mile per hour.
The Atlantic Ocean.
Depending on the exact route, the route is approximately 4,600 miles. Assuming 20 knots (no wind corrections) it would be just over 230 hours, of just over 9.5 days asuming you sail 24 hours a day and do not stop for supplies.