Owners of a resort can start booking online at 8 a.m. eastern, 11 months out from date of arrival; if you want a non-owned DVC resort it is 7-months out from date of arrival. As to the difficulty of getting a 2BR or GV, it is easy to do so if you book online right at 11 months out except for the OKW GV's in the near Hospitality House booking categories, which very often disappears right at 8 a.m. 11 months out. Also BWV standard view 2BRs, AKV value 2BRs, and AKV club level 2BRs often disappear right at 8 a.m. at 11 months out. Also, if considering resorts other than WDW, the same happens with the Aulani standard view GV's.
As to 7-months out at WDW, it can be difficult year-round for BWV GV's, and BWV standard or boardwalk view 2BRs, . Moreover, others are usually difficult during DVC's high demand season from late Sep to marathon weekend in Jan, except that SSR 2BRs are usually open, and SSR GV's can often be found for some of the times during that season, and less so AKV Kidani savanna view and OKW 2BRs. During the low to moderate demand season from the Monday after marathon weekend in Jan to late Sep, AKV Kidani, VGF, and SSR GV's are usually open. OKW (non-Hospitality House) and BLT Lake View GVs are open about 60% of the time, and BLT Theme Park view GV's about 40% of the time, while Jambo GVs less than 30% of the time. As to 2BRs, BWV pool/garden, VFG, BLT Lake View, BRV, and AKV Kidani, SSR and OKW are usually open. BLT theme park view about 70% of the time. AKV Jambo and BCV are often difficult.