I had email on 9/7 saying USCIS had received our RFE reply. The phone message says 60 days but we also had a LUD on 9/13 and online message says "On sep 13...received...."
So I called TSC the other day and asked if I should expect 60 days from 9/7 or 9/13. I didnt get a direct answer... only you should hear soon.
My PD is current so the only thing holding this up is perhaps a security check or the workload on the immigration officer's desk. There's only just over 3 weeks left for the 60 day time period to conclude. I'll post a response if I hear before then.