I also harvested an AK-47 auto earlier this summer. It was the Easy Ryder (can't remember the seed bank off-hand). It went from seed to harvest in exactly 60 days. Pulled a little over 1/2 an oz off of it in a 2.5 gallon pot (I really wish I had put it in the ground). From what I've read, its got several different pheno's though. Some of the phenos will take up to 80-90 days from seed to harvest. For an auto, I was very impressed with the potency of this bud though. It didn't smell or taste terrific, but it was very strong. It was dark green, oily looking and absolutely covered in crystals. I'd give it a 7/10 on the potency scale, which is really good for an auto. I could catch a buzz with just 1-2 hits. 3-4 hits would get me nice and toasty for about 1.5-2.0 hrs.
I've got a question for the other auto growers that might help the OP. For those that have grown specific auto strains, do you know if that strain has a bunch of different pheno's or is it pretty stable? The Easy Ryder would be a great strain for the OP if it was stable. I wouldn't recommend it to him though, since he might get a phenotype that takes 90+ days to finish.