Before answering scheduling questions, you should be clear on the interviewer's expectations. The last thing you want to do is let this question catch you off guard. Perform your proper research on the company, the positions, and their expectations regarding scheduling and hours. If those answers were not self-evident, then now would be the perfect time to clarify. How you answer this question, direct or evasive, will clue them into your openness and flexibility. It is best to be upfront about the schedule you're willing to work. Being transparent at the forefront is the respectful and professional approach. Ask discovery questions, or ask to see a sample schedule if appropriate. As you know, you are interviewing them as much as they are interviewing you. This distinguishes you from the herd as a viable candidate simply because you are both after the same thing - a good fit.