well it all depends on ur grow room and how big ur plants are if their 2 feet now they will bud out to 3.5 to 4 ft tall > and what lights are u gonna use for your flowering?
another very productive way to produce bud is to get clones grow them for 2-3 weeks and switch to 12 hour lighting this will produce about14-18 grams per plant this being about 8-9 inches tall before budding very good bud and is reffered to as the sea of green grow style