there is no set amount to get off any one plant even if you grow at your best you can still not judge how much yield you are going to get. i just read that your living with ur parents and sisters. personally i think its a bad idea to grow in ur house then man. i would do what stinky said and wait till spring find some where nice a quiet where no one goes and grow a few hell grow a hundred just dont get caught coz from the looks of it ur in the us and there alot harder on u over there then they are on us in the uk. just really think about it befor you do any thing always think it through thats my opinion take it or leave it but its there i hope it all works out man take care and a happy new year!