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Trust me Gene, it's possible. I was there for 2 hours and I had to leave because it still wan't over yet. It was at the part where Captain Kirk met the other Spock.

How do you know it's 4 hours if you were only there for 2 hours? Maybe the film finished 7 minutes after you left? Did the 2 hours you were there include trailers and ads before the film? Would you have sex with the green alien chick like Kirk?