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You can figure on 1 1/2 hours to get to the sub. Of course that depends on the boat and the wave height for the day. I find it a pleasant run. Some here dive year round but I believe the visibility will be much better starting in June than March or April if thats a concern and you'll have less chance of being blown out.
What Frank said...
The sub is right at 30 miles from the inlet and most of the boats run between 14 and 20 knots depending on sea conditions. In summer the prevailing wind is SW and it is very common for it to blow a steady 15 knots. Out of Beaufort inlet, the sub and most of the other wrecks are due south, giving us a quartering head sea out and a following sea back. That breeze will make it a steady 3-4 sea, so it takes a bit longer to get out there, and the ride is bumpier, but the good news is that after 2 awesome dives you get a faster more comfortable ride back to the dock.
And of course, we often get beautiful days that are easy both ways.