There's no recent official doc on how long the bg check would take, but the old doc that was probably released 10 years ago say that bg check takes 110 days max for normal applications, for security screening it can take 6 months - 2 years. It also depends if they pause between steps of your bg check, if they do, can take longer as well. If they go through bg checks without any stops, it takes month or two max. We don't know how IRCC has internally responded to increased scrutiny of their bg check process recently - so, that's an unknown factor here as well.
You can look up forum data (which is anecdotal and not stat significant) to draw your own conclusions as well. But, they would be poor conclusions since the data isn't a good sample size by any means.