90 Day Letter-Canada
Some applicants receive a letter from their visa post asking then to submit updated information and/or forms and/or evidence within 90 days.
That is why participants on the British Expats forum informally started calling it a 90 day letter.
Not everyone gets it and not all visa posts use it.
If you receive a 90 day letter, it may add 4 - 5 months (or even more) to your application process. Therefore, it's best to be proactive and keep Citizenship and Immigration Canada (CIC) up to date with changes in your life.
On the other hand, since some documents become stale dated within a certain amount of time (e.g., police checks), there is no point in applying for them too early. When it comes to medicals, you only can do them when CIC has instructed you to do so.