Hello Mr. Goon..
There are a few additinal factors that are key...
What kind of lights/setup ?
Strain?
If you were to grow 9 heavy yielding INDICA plants under 1000 watts HPS, and you are a first time grower using soil, you should be able to get 2-4 ounces per plant...
This would require love, care, dedication to your plants...
iloveyou : )