Yes, you can absolutely leave the Magic Kingdom parking lot and return later the same day without paying for parking again. Your parking pass is valid for the entire day at all four Walt Disney World theme parks (Magic Kingdom, EPCOT, Disney’s Hollywood Studios, and Disney’s Animal Kingdom). To re-enter, you simply need to keep your parking receipt and show it to the Cast Member at the toll plaza upon your return. This flexibility is a major benefit for guests who want to take a "mid-day break" at their resort or enjoy lunch elsewhere. It is important to note that while your parking is guaranteed, the lot itself can reach capacity on extremely busy days, such as Christmas or New Year's Eve, so re-entry might be delayed. However, for most of the year, this is a seamless process that allows you to maximize your day at the "Most Magical Place on Earth" while maintaining the convenience of your own vehicle.