I already interviewed almost 2 years ago. When checking online the normal processing time (N-400, San Antonio TX) it is 9.5-14 months (my receipt date is April 2017, site says anything before June 2018 is outside normal times). When I submit an inquiry, the only answer I get is that my case is under background checks. I got the same answer for the last year or so. Anything I can do to get a more clear answer? When I checked around I discovered that background checks are supposed to be completed before I get the invitation for an interview, but I interviewed and passed. My wife interviewed 3 weeks after me and took the oath about 2 months later.