Sent app in mid July, wife forgot a tax form, sent it in so official receipt of app was October 16. US applicant so Ottawa office.
Sponsor approved first week of January.
Received a documents required email April 8 from CIC, (that I'm starting to think is sort of SOP regarding more proof of relationship), and also requesting a copy of the same tax form my wife sent. Odd, seeing that was a sponsor related form and not part of the sponsoree required info, but, sent it in 3 weeks later so it would have arrived first week of May or so. Along with more proof of relationship (FB screenshots, 2 letters from family, 2 from Canadian friends, an itinerary of my wife visiting me and my family in Virginia end of May, shared credit card proof, life insurance beneficiary proof...wasn't leaving any proof on the table this time)
Started processing May 26, decision made May 28. So now, just waiting on the next step. The whole DM but not what the decision is seems like one more jab in the gut to the whole laborious, anxiety producing process, but it's almost over.