Reminds me of a video I recently watched of a crew of 4 women rowing across the Atlantic in a tiny little boat, taking continual 4 hour shifts for 3,000 miles: [this video]
Four women rowing 3,000 miles across the Atlantic in shifts
Depends on the crossing. Usually they will choose a route that is favorable. This is probably the same as the ocean crossings by row boat. [this video] Generally speaking there is a route called the "Milk Run" from Europe to the Caribbean that has tail winds and good currents in the right direction. Also much nicer weather.
Example of an Atlantic rowing crossing on a favorable route
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