Hehe, yeah, I was super lucky. Vienna is usually pretty quick, but not this quick. I had my visa in hand exactly 3 months after mailing the application. I'm still counting my blessings
From other cases, it seems it takes 2-3 weeks for Vienna to receive the app from Mississauga. They update e-cas on mondays, so if you're checking, check every tuesday morning. My application showed as 'In process' on the 1st monday after the AOR. Good luck!