What you should expect is a 28-36 month processing time for PNP applications. If you're lucky enough to have COPR quickly (<24 months), it's because there were too many factors in the background that simply worked in your favor and you'll never know what they were.
It could be that: Your application is easy to process, your personal information is easy to verify, you're a single applicant, your application is complete, you got an officer who is very good and fast at their job, the officer accidentally approved it and didn't care as they wanted to go home at 4:59 pm, the officer thinks you're a hottie, etc.