This is according to the Washington Post
SINCE “COCO” was released last week, fans have been vocal in their vitriol for the 21-minute featurette, “Olaf’s Frozen Adventure,” running before the film. And the hue and cry has largely been over what a disservice the short is to viewers.
Most parents are upset about the length of the short. The 21 minutes adds a lot of sit still time for children sitting through a movie!