The letter does say that max time this would take is 60 days. So what is the question? Exactly how many days this will take? No one can answer that with certainty or even a proximity. Also, please check the USCIS site for the timeline on NOA2. I think this is showing 5 months if they didn't make any change lately. If I have to guess, I think it may take another 3 weeks to 3 months for you to get the NOA2 if everything works in your favor (all guesstimates). And by the way, for the RFE, was it a typo or you forgot to add the biographic info page of your wife (G325A). A typo can be processed differently, time wise, than an entire form. So these all will have impact on the time.
