It all depends on how much you fly. From day one it took me about two years to obtain my commercial certificate and that included getting my instrument rating. Each school trains at a different pace, but I would say at least a couple of years is the norm. As far as the price in Canada I would not know for sure but it is definitely not cheap. You can pay anywhere from $25,000 to $50,000 to get everything including your commercial certificate with instrument and multi engine ratings. Of course this all depends on how fast you pick up on things so the more often you fly the better (rust factor). Right now getting a job with a major airline like Air Canada would take considerable time. You need major flight hours to even be considered for a position like that. You can probably see their flight minimums on this site under airlines. Best of luck.