WWE SummerSlam 2020 lasted approximately 3 hours for the main show. The event began at 7 p.m. ET and the main card ran for about three hours, excluding the one-hour kickoff show that started at 6 p.m. ET. So, including the kickoff, the total viewing time was around 4 hours, but the official SummerSlam main event portion was about 3 hours long.
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