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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).
How long is a day on other planets. by Colm Byrne on January 3, 2013. When we think of a day on Earth we measure it in a period of 24 hours, actually it takes 23 hours and 56 minutes and 4 seconds to rotate on itâs axis.So, if we measure a day on each planet compared to Earth it kind of makes it easier.Some of the planets rotate and spin slow and some rotate and spin fast so you can see a big difference as they orbit the Sun in our solar system. Mercury - 58 days and 15 hours. Venus â 243 Earth days. Earth â 23 hours and 56 minutes.o, if we measure a day on each planet compared to Earth it kind of makes it easier. Some of the planets rotate and spin slow and some rotate and spin fast so you can see a big difference as they orbit the Sun in our solar system. Mercury - 58 days and 15 hours. Venus â 243 Earth days.