If you are talking about a SALIING vessel that is powered by the wind, it is impossible to say. The winds are variable, not predictable.
If you are taking the Trade Wind route it's pretty safe and it could take as little as 2 months.
Couple days
3 minutes or less
Around the Horn or through the canal?
It can take 18 to 35 days to sail from Sydney, Australia to Perth, Australia. The distance between the two cities is about 3,935 km.
6 months
It depends where you're sailing from!
approx 72 days
21 hours
Winnie the pooh and the blustery day
13 and a half days since its 6,500 nautical miles
it would take 2 days but depends on the wind speed
about a week