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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).
In fact, one day is actually as long as two years on Mercury. It takes Mercury about 88 Earth days to orbit the sun, while Earth takes 365 days. It takes about 176 Earth days for Mercury to rotate on its axis (from sunrise to sunrise), while Earth takes only 24 hours. On Mercury, it is daytime for one year, and night for one year. Considerations. Venus, the planet between Earth and Mercury, also has a day that is longer than its year. Venus has the longest day of any planet in our solar system. One day on Venus lasts for 243 Earth days, while a year lasts about 225 Earth days. Features