AOR in our case, that is , express entry is just filing of PR application. One gets AOR within a day of filing the PR application. So, i would say other than one has submitted all the documents requested for PR, AOR does not signify much.
Getting PR depends more on the authenticity of information and documents that one has shared with CIC. Usually within a month of filing the PR, eligibility, criminality and medical passes. Security is something which is time consuming and can take anywhere from a month to 5 depending upon a number of factors.