ummm u'll have to have noa2 first will can take up to 5 months then another month or more at nvc then u'll have a fair idea of interview date...so i'l say in about 7 months minimum from ur noa1 date
your interview date might be take up to 9 months to 12 months maybe more than that but be fair to say that and nobody knows how exactly it takes mine was 16 months