So you will be flowering in a 4x4 area?If you re going to veg clones for 30 days then you will only get 4 in there max.If you are wanting constant sog then i would flower1 week after first roots have shown then you would get 9 to 12 in there.Lets say 12 then you could put 6 in then 4 weeks later add another 6 then keep going like that, then you would be harvesting every month.One mother would be sufficient for that amount of clones per month and once you get that type sytem up and running you will never be short of weed. best of luck with ur project.the postman.