PRN (pro re nata) nurses, also known as per diem or as-needed nurses, typically do not have a set limit on the number of hours they can work. Their scheduling is flexible, allowing them to choose shifts based on their availability and the facility's needs. While there is generally no maximum number of hours a PRN nurse can work, it is important to consider hospital policies, state regulations, and licensing requirements that may impose certain limits or guidelines to ensure safe staffing levels and prevent burnout. Therefore, PRN nurses can work varying hours from week to week, sometimes just a few hours or shifts, and at other times many hours, depending on their preferences and the staffing demands.