GrumpyOldGuy
Contributor
Those limitations are pretty common around here. I know that the dive ops I mentioned above all generally expect the Nitrox divers to be back on the surface at the 53 minute mark. At 80-90 feet, most divers are getting pretty close to their NDL anyway or are running low on gas.
These were reef dives though, not even close my my NDL and 1500psi in the tank. Since I knew up front they were reef dives, I did not spend the extra $ on nitrox, thinking it would make no difference (technically). I learned my lesson and wanted to pass this info to other visitors, don't be cheap pay the extra for Nitrox for that extra 10 minutes.