The previews are usually 20 minutes long. They start at the movie's posted time.
Previews start at the posted movie time
The posted time is the time when the previews start.
The posted movie times include the previews
Previews start at the showtime listed
Too long.
Generally10-15 min
10 to 15 minutes
20 minutes before the posted show time they run previews of coming attractions
15 to 20 minutes
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