Here's a very good thread with alot of info and pics of plants grown 12/12 from seed with different lighting setups. Alot of the plants yeilded a very good amount for the style of growing. Obviously less than a veg'ed plant, but with many plants in the same space the yeilds seem good. Plenty of them getting ~1oz dry per plant.
First off I think someones missing something, doesnt really sound like SOG to me, sounds like hes gonna plant 30 beans in 1g pots and run a 12/12 right off rip. thats not a SOG. thats a less than ideal way of trying to cut corners to save time.
... if youre in a rush do 24 on until you are 40 days from your planned havest,...