oh 4-5 weeks then get a sulfer burner or safer soap with sulfer, and try not to spray the buds, its going to get on the buds but give a little effore to spray under leaves and on top and the steam and not the the buds, it wont kill the buds if you do but its not to nice to the buds. you still haveent even flushed so you can get rid of the powdery mildew before harvest. try to spray in the grow room too, this is a big reson why white walls are better than mylar or visqueen caseu usualy people spray the hell out of their rooms, and once mylar gets that on it, it will never be the same again.