OKW studios are ones that will last for some time past the 11 month window, although they could be a problem at 7 months out. You can book only 7 nights at exactly 11 months out. If you actually waited until Jan 7, 2018, to reserve 12/1 to 12/14, you could book all 13 nights at once. Basically when making or adding days to a reservation you can reserve or add as many days as you want as long as the departure date from WDW is not more than 11 months plus 7 days from the day you attempt to make the reservation or addition. With an Old Key West studio, you will likely be safe even if you cannot make the reservation until 10 months out.