I agree with my colleagues. It will probably take about one or two months to receive the appointment notice, unless they first request any missing evidence in which case the process will be delayed a little bit. Usually they give you at least two weeks notice until the actual appointment. Sometimes it takes a little more time, sometimes a little less.
It all depends on the service center where the application was filed, but on average it takes about a month or two to receive an interview notice.
Contact immigration attorney Gintare Grigaite, Esq. at 646-407-2331. Answers on AVVO do not constitute legal advice and do not form attorney-client relationship. Always consult an attorney for a legal advice.