A tutor is hired based on a student's needs. If you're an expert in math and a student needs help in that area, then you might be hired to help. Tutoring can be both a long-term or short-term job, depending on the client's needs.
Sometimes one student will need help all year-round. In this situation, you might be hired by the family to help that student understand the difficulties they're going through in school. Or you might tutor at the college level and only help students for a couple of hours.
Your schedule as a tutor will vary greatly. You may help a student for a couple of hours each day after school or you might grab coffee with a college student on the weekend to study for a test. Just before you become a tutor, make sure you know what you're talking about.