Good news is that, it's highly unlikely that OINP reject applications unless you make a mess of your documents in whole new level
Apart from that, processing times vary. If you are good with your documents in such a way there are no scrutinizing needed, you may well receive nomination in a matter week. It's not an exaggeration as one of my friend who applied in June got nominated in a matter of 5 days. While there are some who applied in November, still waiting for their nomination (wish god speed with their case ). Hence it's entirely depend on your complexity of your case with a stroke of luck. Ideally, it shouldn't take 2 months time.