To what end? What is the value of watching a person live their life for 110 minutes?Sure, and as payment you cross the sage's palm with silver. If you're crossing his palm with twenty-one thousand gold pieces in order to gaze into his 10,000 gp deluxe widescreen scrying orb, you might well expect the full length movie rather than just the trailer.
For movies, it's an entire story, but most people don't go through an entire five-act drama in two hours. Once you see them settling down to dinner with a melancholy expression on their face, do you really need to watch them eat?