A lot depends on how aggresive you want to be with your design. If you want to push the envelope with cutting design then definately allow 12 months. If you choose to play it safe and keep the proposal within the tram tracks that is Rescode, then it will mean less resistance and back and forth with council. We have completed dozens of these types of applications in the last 7years. Best was 99 days (Four Townhouses, Bayside Council), even after recieving 4 objections. Worst 18 months and counting (Moorabool Council). Do your homework, get a good designer / architect who is pro active in dealing with council on your behalf.

Best of Luck