Whats the range of how much weed you get from a single plant. Also, how manytimes you would take some off and how long til you can take more off?
do some research, theres alot of variables that change amounts from plants. hydro, soil, light size, room space. some people get like an lb a plant. or like 2gs. if you suck you wont get much if your experienced you'll get an oz a plant indoor usually sometimes more.
Don't forget the plant itself, different plants have different yields. Like pigpen03 suggested, take some time to do some research.