I have many friends (all Nigerians) too that submitted their applications between Aug and Sept 2020 and got COPR within the same year. I think a big factor would depend on the visa office your application arrives in (and I think the visa office you get would depend also on the country you’re applying from) and the workload at the same office. I stand to be corrected. Before I submitted my application in December 2020, I prayed mine would land in Accra
but I guess that prayer wasn’t answered as my application arrived Montreal
Like I said, I stand to be corrected.