sevenseconds,
For your office it is 6 months to process 80% of the applications (one of the fastest offices!). You can expect that it will take anywhere from 2-6 months at that office. For instance our office, Moscow, is 8 months for 80% and we are expecting 4 months as lots of pre-applicants got accepted within that timing.
Note: The specified timing for each office starts AFTER sponsorship approval. So they are saying 80% of applicants get accepted within 7.5months for you (42 days for sponsorship, in our case less than 30).
http://www.cic.gc.ca/english/information/times/perm/fc-spouses.asp
Check the link,
Cheers!