Well, I have limited experience with Autos. I have only grown one variety to harvest (5 times), and my fifth grow is nearing completion. I think that for those that like to count, the clock starts when they break soil (medium). But I don’t count days anymore, because they’re ready when they’re ready, regardless. I started my current Auto grow around June 1 or thereabout, and they only need a few more days ‘till harvest.
After I changed the 400w hil for the 600w hps the autos seemed to have kicked into another gear. I like to keep the light at 18 inches.
Thanks to @ReikoX for the soil recipe he shared, I tweaked a little for me, the plants look great and have needed minimal maintenance or feeding. Just been using some Cal / Mag once a week.
Temperature has averaged 78 degrees and the RH 49%