Plus, it's even possible to do both of the basic studio tours in a single day. That said, if your goal is to relax and not have to rush around L.A., then plan on visiting Warner Bros. on one day and Universal Studios Hollywood the next day. That way, you'll get more enjoyment out of both.

For the Warner Bros. Studio Tour London (The Making of Harry Potter), one day is not only enough but is the standard way to experience the attraction. Most visitors spend between 3.5 to 5 hours exploring the expansive sets, including the Great Hall, Forbidden Forest, and Diagon Alley. Since it is a self-guided walking tour, you can set your own pace; however, even the most dedicated fans usually find that a single day provides ample time to see every exhibit, enjoy a Butterbeer, and browse the massive gift shop. If you are referring to Warner Bros. Studio Tour Hollywood, a standard tour lasts about 3 hours, meaning you can easily fit it into a morning or afternoon. In either case, while the magic is extensive, there is no need to allocate more than one full day to see everything these studios have to offer.