3'4"x3'4" tent sog questions

so this next plan is to fill tent with 16 cuttings in 8x8 pots. im runnin roots organic with canna nutes. mom is white skunk. at that spacing in soil... how tall should they be to induce 12/12? ive got abot 4 and a half feet from light to floor max and i want to get the most out of my 600. any advice is greatly appreciated.
 
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