I am not sure how far out they take reservations. You certainly couldn't make them months in advance, as you do with the Disney owned restaurants.....but a month or so probably isn't out of line.
At the beginning of January I booked for the end of May.
Definitely call direct to the restaurant. You can use Disney's online booking system, but apparently they don't hold many spaces for Disney. I got only a 3:30 pm or a 9:00 pm choice when I tried online, but when I called direct I got a 6:00 pm (which is what I wanted).
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