I just booked 6 nights at POP in September. Exact nights 9/16-9/22. So, when exactly can I start booking ADRS? I'm not really understanding the +10 part.
It's 180 days from your arrival date. It used to be that you had to call every day in order to get those special, hard to get ADRs....it was 180 days from the day you want the ADR for. But now..you can call 180 days before your resort checkin date and make all your ADRs for the following 10 days, rather than having to call each day for each one of those 10 days. Hope that helps a bit.
I'll give this a shot, the way I understand the ruling. The 180 + 10, means, at 180 days out from your first day, you can book all your ADR's for your entire trip. Not sure where the 10 is coming from, maybe WDW just picked a number, but then again, I have never booked more that days at a time.