Photoperiod? You’ll want to start smaller… 1-2 gal, then 3-5, then up to 7+ for a bigger plant. If a photo, you can veg for a long time. I went solocup for 1.5 weeks, then 1.5 gal for 2 wks. Then to 4-5 gal pots for 2.5 before flip. You can go the step further to a larger container before 12/12