Yep lots of variables makes lots of scenarios possible, but as a rough answer to a harmless question, if the grower is of average abilities and don't make the classic rookie mistake of trying to push things too far and overfert, overwater, underwater and many other rookie common mistakes then he should be able to pull 3 ounces of weed dried and smokable per plant. the fact that some of these plants are bagseed is an unknown quality, bit of a lottery with these plants, but advice I would give is just to plod along and don't try to overdo things, learn a bit, and improve things as you go on. One thing I guarantee will have you pulling your hair out in a 4 X 4 tent and a 600W light is trying to keep temps down to workable levels, this is the unwritten hassle that tent growers almost always face. Good luck mate, and don't reach for the stars when its the moon you should be aiming for.