The best way to tell is by using a loupe to check your trichomes. My Early Miss is at day 81 and I just put her in the dark for 48 hours. I quick dried a bottom nug and the smoke is pretty good. My EM ambered up a bit, some autos don't. It's a little bit different than growing photos. If you need any help I'll do what I can for ya, or at least I can let you know what has worked for me. Ther are a ton of people on this site that are bad ass and willing to help. Gotta go. Time for my medicine!