Saturday I did 3 dives about 45 min long each. I dove with single tank divers, so time was shorter than I would normally do. Sunday, I dove with some cave diving buddies. The first dive was only about 25 minutes, as one of my buddies just got a new drysuit & was trying to sort things out. I found a lost weight pocket with 9# of weight in it. Messed with my buoyancy a bit, but was able to bring it up safely. The second dive was a leisurely shallow dive of 70 minutes. We all just sort of putzed around & enjoyed ourselves. I wore my second side mounted bail- out bottle (right side). I never even noticed it was there. I am really digging the Prism2. I really appreciate the quiet & most of all, the extended bottom time & 1/3 the weight of my doubles.. I could hear my OC buddies loud & clear at all times.