After 5 wks of veg you are gonna get crowded with 3-4plants in a 3x3!!! we have to move the outdoor crop indoors at Mamas house, we grow 6 plants at a time. Were gonna need a 4x4 to grow 6plants! That is our legal max per household in CA. Might go with a 3x3 we will see. I do believe the quality of autoflowers is way better when grown indoors under 18-20hrs of light! You dont have quite that upper hand with photos indoors vs outdoors because of the required dark periods. However i was recently reading an article about experimental “long hour days” where the author said he succesfully flowered a photoperiod on 24/12 schedule and it supposedly finished like a week or two earlier than the control plant in the test.
