Ive been researching auto-flowering plants for a couple of months now. Most have a life span of about 60 days, some (such as lowryder crossed with early girl) are shorter than this at about 55 days, and some (like the lowlife auto -ak-47) are longer at about 70 days. As for yield, this varies very much from strain to strain. The auto-ak47 mentioned earlier is one of the largest yeilding, one journal I read the guy managed about 3oz from one plant (although that is exceptional). Sounds like an oz per plant is achievable though. Another strain ive heard about recently is 'flower power' by Barney's Farm - talk is that this one can grow to 4ft+, havn't heard talk of yield yet, but any plant that's that tall will surely yield loads.