Its written 7 days maximum! Canada is a big country, 7 days are justified for domestic deliveries.
But i commented because I c people here saying 2 and 3 weeks ...This is huge time for communicating something that is cosmetic in the first place as you already have an electronic copy attached in ur application with a code that can be verified by mail directly from the source... ... also their are tones of ways to verify such things remotely specially between entities of a high profile, in the same country, working daily on such things and for the Same purpose...
Other Example is how they process Ontario applications and reply queries in a very "robotic and out of the subject "way
This is only my opinion ..I think they must relax it up a little on the routine/bureaucracy and old school methods...a simple example from personal experience ..it take an average of 2 weeks to receive a reply-regardless of being relevant or not in the first place- online/by mail from WES or OINP even if u have both EE and OINP profile #'s ...while for example ACS(Some sort of an alternative to WES in Australia for IT,which additionally evaluates and assesses your work experience in full !)...replied to my shower of emails within hours ,,although I do not have any official presence in their immigration system or programs...actually the maximum time spent was 48 hours and they apologized for the delay