Do you mean that your application was sent from Mississauga to London?
If so, you should look at the London Thread link in my signature, as it is a thread specific for applicants being processed in London.
Also in my signature there is a link to a spreadsheet which I help maintain. The spreadsheet tracks applications going through London.
If you would like to be added to the spreadsheet please provide the following:
-Date application received in Mississauga
-Whether you applied as Married or Common-Law
-Date of sponsor approval
-Which office is processing Phase 2 of your application (will say on your sponsor approval letter/email)
-Date the permanent residence status changed to In Process on ECAS
-Date(s) of any other requests you've had
-Whether or not the principal applicant is non-visa exempt
-Current location of the principal applicant- closest major city is fine if you don't want to be too specific!
-Date of medical exam
To answer your question add on a year from when you get/got sponsor approval and you should have your visa by then assuming your case is straightforward.