Are you sure about this? Isn't AOR just Acknowledgement of Receipt? Most PR applicants would get this within 48 hours of submitting their application.They used to send AORs (stage-1 approval) and than admissibility and authenticity of all other documents, they just renamed it to two stage process.
I think maybe you meant the "Completeness check", which was separate from, and done after AOR but before Eligibility check.