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One Earth day is equal to 23 hours, 56 minutes and 4.1 seconds (the time required to complete a single rotation of the Earth).
A Day on Each of the Planets. A day is the length of time that it takes a planet to rotate on its axis (360Â°). A day on Earth takes almost 24 hours. The planet with the longest day is Venus; a day on Venus takes 243 Earth days. (A day on Venus is longer than its year; a year on Venus takes only 224.7 Earth days).