With a auto when the seed pops the time clock starts,,, period end of subject. We as growers have no idea what that time span is. The breeder has a idea and publish that idea. And it's just a average and marketing. It's life clock is running and you best be on your A game. I consider autos to be the domain of a advanced grower. A lot of beginners get suckered into autos. They grow faster, they flower faster, you get your weed faster, there easy blah blah blah. Every misstep, every mistake stunts them and those mistakes are compounding. And you never have time to truly correct it and get that stunting mistake back.
I like to grow autos in the winter. And I run them 20/4 or 24 hours straight. Seedling always run 24 hrs straight for at least two weeks. If they seem to like it they stay 24 hrs. If they don't then it's 20/4. You have to drop down on the PPFD because your running the lights longer. That's where the DLI for autos changes verses photos. So one has to really stay on top of the lighting. That pushes your watering and feeding and environment. You have to have a A game in the world of autos. That's why I always tell beginners to start with photos and dirt. A basic grow and get it down. Then move on to autos if you want. Then rip off into a photo coco grow. Get that down go in to coco auto's. Have all that in your tool kit then go Hydro and Blow & Go. And then at some point you will get sick of mad scientist crap and be back to basic dirt grows like I am and happy as a pig in a mud hole with basic organics.
The struggle is real!

