if at a disney resort on a cash basis i would assume it is same timeline as booking a hotel ressie through expedia, hotel.com, directly with hotel chain etc. i know you can only book airline ressies 330 days or less out since they don't publish fares, routes, timetables until then. possible that hotels are 360 days out, but could be 330. go to expedia and try booking there. they do provide disney rooms for rent.