JimC:One point not mentioned yet. Suppose you are already a highly skilled diver and could pass full cave in 8 straight days.
You will be beat, dead exhausted by day 4. I mean *** dragging wasted. Doing cavern and intro back to back is hard enough on the body and mind. Long days of concentrated work on skills, both new and old followed by a mad dash to consume enough food to quell the raging hunger and then its time to hit the books until the we hours of the morning.
You are correct. There is a lot to absorb,and not much time to reinforce those skills and lectures. When you are tired,physically and mentally you start to make mistakes,and no longer actively learning,just doing.