This question really belongs on the restaurant board, not here, but I'll try to answer it.
As far as I know, anyone can make ADRs 180 days out. When onsite guests call, they may make ADRs 180+10, meaning 180 days from arrival , plus 10 days after arrival.
With regard to the 180+10, it's important to understand that not ALL availability goes into the +10 part of that. If you are not successful with the +10, call back on the exact 180 day mark and you may well be successful.
I have not heard anything about 14 days, but there are many things I haven't heard about.