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You need to tell us what visa office or processing office you are applying through, we really can't guess.
 
So you submitted your application to CPC-Mississauga in January 2011. Which VISA OFFICE would process the applicant?
 
i have received letter from them saying that they have forwarded the application to visa office in Islamabad. i have received the letter in march 2011.
 
The timeline for Islamabad is 24 months. You may get an acknowledgement of receipt from CHC-Islamabad, but it can take 6 months or more for them to send one, so your husband may receive one sometime soon. Other than that, it will take awhile for them to process.
 
Hi ghazalawattoo, you may want to look at the islamabad 2011-2012 thread to see experiences from people of similar case:

http://www.canadavisa.com/canada-immigration-discussion-board/chc-islamabad-spouse-sponsorship-timeline-2011-2012-t63735.0.html
 
hi my husband recieved a letter that they ask for re-medical and police certificate and he sended already so could please tell how long is going take after that.thankyou