Under the old application INLAND Spousal applications usually received SA in around 16 months from the date CIC received your app. Since changes from June of 2016, that has been getting quicker. Many seeing them within 12-14 months now.
Under the NEW application, only a handful of INLAND applications have received SA within a few weeks to a few months. There is no real estimation on what is normal now.
OUTLAND Spousal has always received SA within around a months time. This was because the application needed Sponsor Approval before it could be transferred to the Visa Office that would handle the application.