From the cic website:
"These processing times only apply to the federal part of the processing (at the visa office) once we have received the complete application. It does not include the time it takes for the province or territory to process the nomination certificate.
Processing times tell you how long it took Immigration, Refugees and Citizenship Canada (IRCC) to process applications in the past after receiving a complete application package. Processing times can vary, depending on how many applications IRCC receives. Your application may be delayed if it’s not complete.
If it has been longer than the time shown since you applied, and you cannot check the status of your application online, you may contact us by using this Web form"
who knows maybe "receive complete application" means AOR? maybe not? It's not very clear.
it starts from when they receive your application, not AOR