Use it as soon as you see it on this board. Check it every morning if possible. The selection becomes limited as the days go by. I used this board for the codes that came out in October for our Feb trip. I had to argue with 3 CM's before I got one that would actually check the system for the codes. The very nice CM that booked my trip said, "Lady, you really have your stuff together, these codes were only released about five minutes ago." I told him, "that's my friends on the DIS, they know everything." You can't go wrong with these boards. Just FYI we got the WL woodsview for $126 a night with the AP Code back in October. Remember, if your plans change, it can be cancelled or if a better discount comes out, it can usually be applied.
Good Luck, I only have 14 days left.