Cheers String, some good points, bailout would be to get me back to the surface safely, I wouldn't expect to continue the dive and with a SAC of around 7 (when working reasonably hard, not fighting a current), I'm as good on air as the best of my clients who in the main are on OC anyway. If it was a planned deco dive I'd approach the whole bailout aspect very differently but equally it would probably be off a boat anyway so weight and bulk would be less of an issue.
Your point re fine tuning buoyancy is one I hadn't thought of, on OC I can be in any position and instinctively know when and how much to breathe in or out to make micro adjustments and I think, now, that I would hate that aspect of it on CC.
4hrs would be plenty, it's rare I do more than two dives/day and would be back at the DC and able to top up/change lime etc if I was planning a 3rd dive anyway.
One of the reasons I'm keen on no/small bailout is to avoid the time it takes to ferry stages etc back and forward as well as carrying the unit and I don't want to drag a unit plus fairly heavy stage up and down to the Blue Hole twice a day in 40c+ heat August, it's hard enough with a heavy 12l
And YES MrPOman there are plenty of fish in Gozo, you just need to know the island and have the right dive skills. If you can't see them then I suggest looking inwards mate.
One of the things that made me reconsider this whole subject is a night dive I did a couple of days ago, I found a shoal of baby squid, which are always shy and easily spooked, every time I got close to them at the slightest exhale they scattered and I then had to spend another 15 minutes searching for them again, took me 75 minutes to get two shots of the little sods
Paul if it looked like I might have to work hard to get out I wouldn't get in My 3 stages of risk assessment are, 1. Can I get out safely in these conditions? 2. Can I get my clients out safely in these conditions? 3. Can we get our cameras out safely in these conditions? Carrying 10 grand plus of camera and maybe needing one hand for it tends to make you even more cautious.