Football games usually last three hours - although time outs/challenges/etc may make the game last a little longer. Since the kickoff is set for 6:20, the game should be over around 9:20-9:30.
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According to the NFL's Game Summary, Super Bowl XXXIX took 3 hours and 38 minutes to play. With a start time of 6:38 EST, the game concluded at 10:16 EST.