On the right, first pic of the post :
A bit below twos dozens, at the end of the vegetative limit permitted by this strategy. Seedlings can be “forced” (horticultural meaning) just like clones without much impact on little seedlings pot / cups. With shelves/cheap neon by floor, you can multiply by three the density. They also like to have the ass warm, just like clones ^^
I say that as bad advocate, I’ve actually reduced to a single 4x4 to avoid the whole veg maintenance. I can do it considering the context (no exploration at all) and that harvesting weed is secondary for me.