Almost 9 months.

My app # was WAC1290519XXX
Application was received 9/4/2012
Biometrics on 9/21 as a walkin in Oakland CA
RFE posted on February 20th 2013
RFE being mailed back on April 12th 2013
RFE recieved at Nigel in CA on April 16th 2013 (Online status for I821D was recieved RFE)
*****APPROVED 4/29 (Text message for my I765 at 3:15 p.m.however I821D still not updated)

RFE due date is May 15th 2013