Not everyone feels fatigued. On weekends that I go out with OW classes, I may dive 2-3 times with students in the morning, then another couple of dives in the afternoon. On liveaboards we to 5 dives a day. I will be tired in the evening, but it's the same type of being tired that I would get after a day of swimming. When I dive I drink massive quantities of water and eat several small meals throughout the day. The last 20' of my dive I come up a lot slower than 30' a minute. It may take me 2-3 minutes to come up from 15'. On recreational dives I also do deep stops.
Carrie
Carrie