Not sure what you mean by end of Feb.
Next year, the Presidents' Day holiday is later than usual, February 20, which means the Princess half marathon weekend, which is always the weekend after that holiday, will be February 24-26. During
DVC's low to moderate demand season which runs from mid-Jan to late Sep, it is the Princess half marathon weekend that is actually the highest demand period during that entire 8 1/2 months. In other words, if you want any near park resort for that time, you should seriously consider booking with the 11 month window.
If instead you mean that your arrival date is the Monday or Tuesday after that weekend, Feb 27 or 28, then you can likely wait until the 7 month window as the time in Feb immediately after the race weekend until about March 15 is one of the lowest DVC demand times of the year. Although if you want certainty, book earlier.