Movie theatres typically include the runtime of the trailers at the start of the movie in the overall runtime. This means that customers should factor in the time spent watching the trailers into the total time they will be spending in the theatre. Knowing the full runtime of the movie can help customers to plan their evening and decide if they have enough time to watch the movie they want. It is important to remember that the trailers often run for several minutes and can add to the overall time spent in the theatre. Knowing the full runtime can also help customers to decide if they have time to grab snacks or if they should purchase them ahead of time.