How long are the hours of each class in Princeton university?

Princeton University doesn't have a standard class length across all departments and courses. Class times and durations vary widely depending on the subject, course level (introductory vs. advanced), instructor preference, and whether it's a lecture, seminar, discussion section, or lab. Some classes might be 50 minutes, others 75 minutes, and some might even be longer or shorter. There's no single answer.