that depends of your visa office........ but just to give you some ideas, after the AOR, it could take up to six months to get your application in process, another 2 for decision made and you will spend like 1 month for sending your passport, get stamped and the way back to you.... I could say in the BEST scenario, at least 10 months.
check out some timelines from the members of the forum.
https://docs.google.com/spreadsheet/ccc?key=0Arq4O7UkDMdwdFVXOVNRTG9rNlpYbVdKVl8zYXpuR3c#gid=0
I hope this helps.