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The planet Mercury takes 58.6 Earth days to spin once on its axis.
The planet Venus spins so slowly on its axis that one day on the planet lasts nearly 243 Earth days.
With a day length of 24 hours and 37 minutes, Mars has a day similar to Earth's, which is one of the reasons that Mars is often thought of as something of a twin to Earth.
The canonical day length on Jupiter is determined by the rotation rate of its magnetic field, which is nine hours, 55 minutes long.
The planetary scientists determined that the official length of Saturn's day is ten hours and 33 minutes.
The planet does rotate on its axis once every 17 hours and 14 minutes while earth rotates earth on its axis every 24 hours.
The gas giant planet Neptune has a day length of approximately 15 hours.