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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 Mars takes 24 hours 39 minutes and 35 seconds in Earth time. The length of a day is similar to a day on Earth, which is one reason why scientists believed that plants and animals could survive on the Red Planet. Jupiter is the largest planet, and it also has the shortest day.