When I did ebb and flow I could fit 72 - 4 in cubes on a table,I had 6 tables,6 1000W hps and flower the clones as soon as they rooted , I did it quite a few times,
sea of green, but then your stuck with all the cubes after harvest to dispose of,I had to dig holes in the yard to bury them ,it was illegal at the time so I couldn't toss them without suspicion and also the price of the cubes was high and going to the store to buy them was risky so I quit using rockwool and then went NFT with no medium,just clones sitting in tubes,I would root them in perlite and then immerse the rooted cut in water to wash off the perlite.