How long do you envision committing yourself to this position?

How you answer this question will offer insights into your ambition and where you want to take your career. It'll also reveal how well your future aligns with what they have to offer you. Basically, they're seeking to ascertain if this is the right job for you or a job for right now.

If you haven't already, create a rough draft of a five-year career plan. Break it into attainable goals. Share your vision with the interviewer, revealing the detail of your ambitions, with an understanding that sometimes these goals get modified along the way. Inquire about what kind of growth is available in the particular department you are interviewing for. Consider the mutually beneficial opportunities working for them would offer you both. Once you have this mapped out, you can communicate your answer in a manner that should meet their expectations.