Correct, it all depends on how complicated or simple it is to verify your background. I have been in Canada for 7 years since I was a high school student, 2 traveling history abroad and working for the same employer for more than 4 years. My spouse also came here as a student and never traveled abroad in these years, AOR 1st March --> PPR 25th April
It may also be affected by how lazy or productive the officer is, each processing office has tons of officers but we won't know which officer ends up with our application, it's all about luck I guess