Me
Applied in Aug 2013, in process since Oct 2013, phoned CIC last month and was told "background checks are done, application looks Ok, just wait for the test letter.
I dunno what your office is, mine is Vancouver, one of the slowest offices, yet I have seen so many people in this forum who applied 1 - 2 months after I did but taking the test is aside; they already took the oath.
So, there doesn't seem to be a standard time for processing.
Good luck