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And sometimes they do one 6 hour or two 4 hour dives. I personally made a 250 foot dive and cleared deco on the way up. Who know it was 50 degrees on the Wilkes Barre on the bottom, and shorts and a rash guard was inadequate?I think the one "big" dive, or even two, per day common practice and conventional wisdom has been created by the logistics limitations of transporting enough open-circuit gas to the dive site. Somewhere along the way somebody has codified this in to more than two dives per day is an unacceptably high risk. I'm aware of some expedition liveaboard trips where if you told those guys they were limited to two dives per day there would have been a mutiny.