How long for a decision after SR opened for I-485?

mailsunnydeol

Registered Users (C)
My PD is current and also my Processing Date for I-485 is current. I had called the USCIS customer service and opened a SR for my case (Outside Normal Processing Times). I received an email confirmation of my request. The email confirmation said that my case is currently waiting assignment to an officer. This may take 60 days of the date of this letter.

Can any one tell me, how long does USCIS typically take a decision in processing the case after a SR is made?
 
Progress so far:
Aug 3: Card Production Ordered email received
Aug 6: Approval Notice Sent email received
Aug 7: Welcome Notice Received by Lawyer and courtesy copy by me
Aug 8: Received the Green Cards in mail (for me and my wife)
 
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