6 - 7 ft would do. i end up putting rain cover over when flwering
I don't grow too much outdoors anymore but I always liked to keep them un-topped and Christmas tree shaped because I can never grow those giant donkey dick colas in the tent and I think it does better with air flow and bud rot/pm etc because the shape gives it better exposure/circulation.
thank you for your reply. i hear you saying to just let it be, that by pruning the plant might get to dense and not good air flow. thanks again.