In December Chef Mickey's was still at 180. It might be 90 now though. If you want that one call and ask. We made it the night we booked. There were a few more that the post above listed. Most are 90 now. I think my day is the 14th or 15th of March to make the rest of mine.
What time do the phone lines open? 7:00 AM?
It is funny, our first 3 trips down, nobody, including us, used the dining plan. I used to call from our room every morning and got whatever ADR I wanted. The last trip a friend of mine who goes EVERY YEAR tipped me to do it in advance because we were trying the dining plan. It worked out great.
I'm still guessing that 98% of the people going will either wait until they get there or wait until they are a week or two out to call. The 180 was nice because it gave planners like me a big advantage. I bet a few more people will be on it with the 90 day window, but it is still OK if you get it the 1st available day. Like I said, we already have Chef Mickey's which is the most popular.