I'd recommend staying on the protocol as long as possible. The longer you are on it, the more milk you will make. I was on it 8.5 months, and I have a full supply. I am not saying you have to stay on it that long, but at least 3 months would be a good thing, and preferably 4-6 months. Unless you get your baby before that, of course. It takes your body 9 months to get the milk going during a pregnancy. You want to give your body enough time to get milk makers in your breasts working properly.
Good Luck!