I don’t know if this could help you in any way, but my master’s program in Canada was 1 year long, so if the visa officer was really gonna dig and search, I would only get 1 year PGWP. I found my master’s program too challenging, so I took fewer graduate courses and included 1 or 2 undergraduate courses each semester(and maintain full-time), so I finished my program in 3 years. When I was asking my school for the completion letter, i kindly asked them to indicate my start date and end date, which fortunately they did. My admissions letter which has a section for immigration details indicates that my program is at least 2 years ( I don’t know why, but guess it’s a general way the school use). My transcript would also show that I studied for 3 years. So I ended up getting the 3-year PGWP. Now I’m in the final stage to become a PR.