First, be sure to send thank-you emails one day after the interview. This is a great way to set yourself apart and show the employer you made the extra effort. Also, I'd recommend reviewing this in-depth article on tips for how to pass a job interview. It contains some of the best info I learned while working 5+ years as a recruiter. However, the time-frame for selection varies depending on the nature of the position, the interview schedule and the availability of individual candidates and interviewers for interviews. As a result, the Selecting Official and/or Interview Panel is often the best source of information regarding the projected time-frame for filling the position.