4-5 dives a day with NC wreck diving? That is the exception. Most dive trips are two tank and a few are three tank trips. A private charter inshore might get to four but not that common. I have managed to get 4 in once but it was two two tank inshore dive trips with the second SI a boat ride in and a boat ride out. Aquatic Safaris now runs that to the Dredge/Stone once in a while on their smaller boat. Nice little dives but not what folks think of as NC wreck diving.