Each case is different so its impossible to say, how complicated your case was or how busy they are makes a difference. You might call USCIS customer service, tell the customer service agent that its been over 60 days and ask them if they will look into the situation.
Legal disclaimer: This answer is offered for informational purposes only. It is not offered as, and does not constitute, legal advice. Do not rely on this advice without speaking to an immigration attorney in detail about your case. This message does not create an attorney-client relationship.
I agree with my collegue as to each RFE being reviewed on a case by case basis. The 60 days is a USCIS self imposed best practice and not meant to be anything more than that. The 60 goal was set in this press relase http://www.uscis.gov/files/pressrelease/casemgmt.pdf
You can contact USCIS customer service or make an INFOPASS appointment to check on the status of your reply. Good luck.
Legal disclaimer: The statement above is provided by CC Abbott is based on general assistance and not intended to be a legal opinion because not all the facts are provided. The person requesting information and all others reading the answer should retain an attorney who is permitted by the state bar within the jurisdiction who can examine the complete facts and provide a legal opinion on your case. All information provided in the above answer and other information provided by CC Abbott does not create an attorney/client relationship within any state of Federal law.
since you are past the 60 days you shoudl call the 800 Customer Service number and put through an inquiry. have you moved?
Lynne R. Feldman, Attorney at Law
Concentrating in Immigration and Nationality Law
2221 Camino Del Rio South, Suite 201
San Diego, CA 92108
phone: (619) 299-9600, facsimile: (619) 923-3277
Formerly Adjunct Professor -- Immigration law
University of Illinois College of Law