Pot size

I grow two plants at a time.
I like to be able to move my pots around.
I find that five gallon pots suit me well.
The plants do well.

(I hope that 'cuts the mustard')

 

Pot size depends a lot on the medium you use. Soil is usually 5 - 7 gallons - coco can be as small as 2 gallons.

 

Using soil I've ran autos in 3 gallon pot size no problem , and i use 5 gallon pot size for photoperiods with 8 weeks veg no problenms. With your size closet i would only run 2 plants in either 3 or 5 gallons will work.

 

I have 2:1: .25
Soil:coirerlite
Must roots grow thin and bushy. I had two 2' sunflowers in a single 1 gallon pot. No roots were at the bottom or circling the pot. These plants were thriving. Much more space for them to continue to grow.

 

I would do one plant in that area and scrog it. I would work up to a ~10g pot size, maybe 7, 5 at least.
something like this

 

from seed, prob about 6 or 7 weeks, maybe 8 can't remember, was last year. My point of showing u is for you to be aware what you can do. I suppose you could do that with two plants in a 2x2' scrog ... faster

 

also suggest u read a lil of Mick's thread:
Mick's Coco - K.I.S.S. - Scrog Method

 

8 weeks is not enough for such a plant, depending on which variety, I personally adore ak47, a white widow, I usually plant them together first, and after 6 weeks I plant them, because the growth is uneven, and I use plastic plant pots, good pots, and They look cool, the varieties are very different and the properties are also different, although what I bought in the store is very different from my AK47, so I don’t take it from dealers anymore, I grow it myself, pots https://getpotted.com/planters/plastic/, by the way very high quality, I use it many times already.