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2 cu. ft. is around 13-15 gallons of soil, so about 4-6 depending on how full they are. I usually fill mine most of the way, but leave like an inch or two unfilled at the top.
I have all my girls in 3 gallon pots. I have gotten upwards of 2 o's per plant under a 400w hps. You can easily achieve that under your 600w. Good luck!