When can I know if selected or rejected after entire interview process?

By when will I be informed if selected or rejected if I have had all rounds of an interview? If I have had director’s interview and hr sounded satisfied with me and they said they will get back by said date, how long should I wait? Does eLitmus inform us if rejected after final round or is never being contacted the sign of that? How long should we wait to understand that it’s never?