I called and asked that question to Nautilus, and they said people waiting for the cages dies down after the first day. There are some diehards that want to stay in the cages as long as possible, but waiting is not an issue.Interesting, I presume that is for the surface cages only (I think I read they had a 3-dive 30-minute limit for the submersibles). How does that work if there are people waiting to get in? The Solmar V rotate people every 60 minutes, with unlimited turns. My assumption was that the cages always have people in them (if they don't, then the whole point seems moot since there is nothing to limit).