should take no more than 70 days from germination to harvest, I didnt get the blue mystic but I did get the other nirvana autos and Ive had them outside for about 50days and I'll be chopping within next 2wks. The northern lights is actually almost 4ft tall which is surprising, the bubblelicious and jock horror are also big at 3ft, I wasnt expecting them to get quite as big but hey I'll take it, should be between 40-60g after its all done, maybe more. The one thing I did hear about a while ago was there was a bad batch of the auto blue mystic, I know nirvana was aware of it and took care of the problem, not sure when you got your seed but hopefully it wasnt a part of that batch. I had only grown the JD easy ryder which was pretty darn good compared to what I was expecting in both yield and quality, I started them under MH for a few weeks before going outside so the easy ryders stretched a bit in the beginning, but with a nice long cure its actually turned out to be some quality smoke, I'll know more about nirvana's quality here soon but they have already surprised me. Good luck, take care, peace...