How long is Mars Day?

About 24 hours, 39 minutes and 35 seconds.

A day on Mars, also known as Mars Day, is about 24 hours, 39 minutes and 35 seconds, which is slightly longer than a day on Earth. This difference is mainly due to the fact that the rotation period of Mars is longer than that of the Earth. The time of Mars is calculated according to the rotation of Mars, starting from the moment when the North Pole of Mars points to the sun, and each revolution is called a Mars day. The difference between Mars time and Earth time is 25 minutes and 37 seconds. This is because Mars runs and rotates faster than the Earth, 25 minutes and 37 seconds more every day.