The topic of travel will almost certainly come up during your interview. Many large firms send their auditors out in the field for a good portion of the year. Even smaller boutique firms require several overnight trips a year. Given this, be prepared to articulate how much travel you are comfortable with (for example, 25%, 50%, etc). Most job descriptions will include the expected amount of travel. The interviewer is gauging whether you are a candidate that is willing and able to meet the travel requirement, so try to align your answer with the expectation of the role.