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Based on five whole dives with the oldest (our current big breather) I figure we'll get 40 mins max on our AL80s. And as you said, that wouldn't be a square profile either. He doesn't seem to be nervous breathing, he just burns through it by: sprinting, turning to check on his buddies (me and the youngest, so far) and then repeat.
I appreciate your write up. I am reading all of the posts. Not because I need it this weekend (I now know) but because I do like understanding what I am getting into as our skills/comfort/depths increase.
also of note is that when you dive Nitrox, even if planning on doing identical dive profiles, it is important to calculate your EAD for each bottle and dive the "deeper" mix first to maximize your bottom time. I.e. if doing identical dive plans with one dive on air, one on EAN32, you'll want to dive the air tank first since it's "Deeper".