Since end of July 2014, the time it takes to receive AOR has gotten significantly longer (the wait time is currently like 120 days). Right now, those who applied in the end of August to beginning of September are receiving AORs.
We don't know if the AOR wait will remain around 120 days, will get shorter now that the holiday season is over, or longer for some other reasons. There is no way to tell at this point.
But if you applied in October, I wouldn't worry too much about it. Just watch out for returned application which seems to happen a month or so after the applications reach CIC. Also find out if your credit card has been charged or bank draft has been cashed yet.