In the CIC website the processing time is 12months, so whenever I called CIC in the past 8months they said "everything looks fine and they don't need any additional documents, just be patient, there might be too many files in your area." My impression so far is that it really depends on the officer who has your file, if he/she is available, not on vacation, in the mood etc. These are all speculations of course, but based on the day I was interviewed I could see the difference between my interviewer and the interviewer of another applicant (our test/interview was done in a hotel and the interviews were done in the hotel cafeteria and you can see other interviews from a distance). You can see that one officer asks more questions the other wants to get to the next applicant faster. And for sure it also depends on your file as well. But when there are files that during the process didn't require any additional info by CIC and seemed to be normal based on your call with CIC, the reason that comes to mind for the delay based on my impression is what I mentioned earlier.