I'd be flowering 36 newly rooted clones pruned to a single lead in there in 6" pots of hydroton. But that's just me.
Growing from seed, I'd start 10, cull the runtiest one in the late seedling stage, grow on 9 to sexual maturity, flip to 12/12, remove males, grow on 4 to finish. If there are more than 4 females, save one for a mother. Take cuts anyway so you will save time on the next round.