Typically, about 30 days...BUT, some applicants never receive an official email from CIC as their AOR.
If you know that your application was delivered to CPC-M (applications were no longer to be sent to CPC-V after Jan 17, 2014) and have delivery confirmation, that is in essence your AOR date.
You can wait a couple more weeks and contact CIC if the sponsor does not receive the AOR email.