Aside from the excessivly loud advertisements before every showing, when do the movies actually begin? As an example, you advertise that a movie starts at 8 o'clock, but there are always screaming previews for at least 20 minuets if not longer.

Keep in mind the actual owners of the theater are a large corporation and may not read anything here. You'd be better off calling the theater.

Unfortunately it is owned by a large corporation and I agree the ads are ridiculously long but the theater has no control over this, previews start when it says the showtime will start and usually last 20 to 25 minutes so if it says it starts at 8 I'd assume it would actually start around 8:25

There usually is about 10-15 minutes of previews before the movie actually begins. This gives you time to settle in and enjoy the previews of upcoming movies.