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i always going for 15-20 i think that in less you just don have enough time to show anything. plus i don't think it matters that much, people even want to see the movie if you offer them a 1 min clip. The actual movie is 30 to 50 min so i even think 10 min will get them in. It is albout wanting to see the full movie. So as long as you don't show the biggest part andbest part of the movie you will be fine.
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