Anything from 256 to 1.
Me, I'd do 16 as long as I had full access to two sides of the tent. As in both sides open enough to manage one side from either .
Otherwise your looking at needing space to get in and work on them
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HI,
I have done 6 plants from seeds 5x5 tent.. They grew 6 montths in phase 1 and another 6 months in the 2ndphase They awarded about 5 feet. I had to add.an a/c and open some of the windows.
It worked out very well.