There are many factors will determine this. There is no simple answer.
The time of year, the type of boat, the weather, the origin and the destination are just a few.
It could take any amount of time from a few days to a few months.
How long did it take to cross the Atlantic Ocean in 1902
Many modern fighters can cross the Atlantic in 4 hours or so.
At 30 knots it would take about 6 days for an Aircraft Carrier to cross the Atlantic. And about 10 days to cross the Pacific.
10 months
Ages you'd have to go down through Panama then cross the Atlantic then through the Gibraltar strait
That depends on where you start & where you intend to arrive. Also the time of year. Also the size of boat. Motor or sail? Intending to move 24/7 or stop to rest?
5 minutes
it takes time
One week?
October 12, 1492
8 months
approximately 13 hours