If you are succeeding in presenting a series of compelling stories during the interview, you will likely develop a rapport which places the communication on a more interactive level.
However, as you are presenting information during the interview, you may need to test the waters with the length of your answers. This can be done easily with the Pregnant Pause. As you are telling a story or example, pause at the conclusion of the story. This will be the cue to the interviewer to take back control with another question or redirection of the original question. But if the interviewer continues eye contact during the pause, use this as a cue to go on and provide another example.
Most interviews do not have established ground rules, agendas, or programs. They can and do change and adapt based on the interaction between the interviewer and the interviewee. So how long should your answers typically be?
It is always a good idea to keep your answers within two minutes maximum. You will have no idea at the outset if the interviewer has two questions or twenty. By proper use of the pause, you give the interviewer the opportunity to stick with their overall plan and schedule. And, if appropriate, you can continue to give further details or an entirely new example.
A side note to the pause is the converse reaction—an interviewer should not have to interrupt your answer. If you are interrupted, give control back to the interviewer. Take it as a tip that you will need to shorten and tighten up your following answers.
One additional side note: never interrupt or finish a sentence for an interviewer. Even if they talk extraordinarily slow, be patient. Remember, they are the one who holds the ticket for admission.