OregonMeds... great answer, laughed like crazy.
but seriously, danthemann, this really depends on strain, lighting, co2, nutes, soil, etc etc etc any many other variables unknown to man. If you're growing an indica, don't expect alot of yeald, but if it's one of those gigantic sativas, that can strech all the way up to 3-5m, you're gonna be major happy with your yeald.