It depends on the sea conditions and weather. Most of the time the travel time for a boat usually takes little over 2 days from Oahu to the island of Hawaii. Usually the only methods now to travel between island of Hawaii to Oahu by boat, is barge service and cruise ship, cruise ship is maybe about 1-2 days and shiping stuff over by barge is about 2-4 days at the most, it all depends on the location each ship is head to.
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