Now, in all seriousness, I vape too dang much. Plus I'm using dual coils (yes, I've heard all the arguments against but, trust me - they're for me).
I get maybe 4-6 hours with the Biggie (if I'm sitting around doing nothing). MUCH more on days I have anything to do. But I just figure that I might as well get the maximum allowable time, even if that turned out to be two or three days (which I highly doubt it ever would, in my case).
But if someone needed to go a little smaller, for whatever they're reasons are, there's simply no going wrong with ANY decision related to getting a ProVari. All you need to do it fit it to your own personal needs.
It WILL perform. NO ...... required.
(oh well, so much for the "In all seriousness" part)