Well, I guess that depend on the op. If you blow through a tank in 20 minutes, there is shade and snacks. And the Capitan is entertaining. We will be along to join you. We dive our tanks. As for fair, you got the same tank I did with the promise you can dive it as long as you want or can. If you 'prematurely empty your tank' and don't want to sit on the boat, go with a time limited op. Coz has something for everyone.
That being said, I used to be the guy on the boat early. That time sitting on the boat was instructive and convinced me I need to get my air consumption together.
That was describing me my first several years of diving...a trip to Thailand on a Liveaboar and constantly being the first one up truly was motivating for me to get my air consumption under control.
