If you are taking AP classes do have to take those in college or them for a shorter time?

No, you don't have to take the same subjects in college that you took as AP classes in high school. AP classes give you the *opportunity* to earn college credit, but it's not a requirement. Whether you receive college credit depends on your score on the AP exam and the college's policies. Even if you get college credit, you can still choose to take similar courses in college for various reasons (e.g., to strengthen your foundation, explore the subject in more depth, or fulfill specific degree requirements).