* Animation can be more efficient than live action. Live-action films require actors, props, sets, and other physical elements, all of which can take time to set up and shoot. Animated films, on the other hand, can be created entirely on a computer, which allows for greater flexibility and speed.
* Animated films can use shorter takes. Live-action films are typically edited using longer takes, which can help to create a sense of realism. Animated films, on the other hand, can use shorter takes, which can make the film feel more fast-paced and energetic.
* Animated films can rely more on visual storytelling. Live-action films often rely heavily on dialogue to tell the story. Animated films, on the other hand, can use visuals to tell the story more effectively, which can reduce the amount of time that is needed for exposition.
As a result of these factors, animated movies can often seem shorter than live-action films, even though they may actually be the same length.