How long is a day on Mars?
A sol lasts 24 hours 39 minutes; a Martian year lasts 687 Earth days.
Mars turns almost as fast as the Earth, so its days feel familiar. Mission teams live on 'Mars time' for the first weeks of a landing, shifting their clocks 40 minutes later every day.
Its axis is tilted about 25°, like the Earth's 23.4°, so it has seasons — each nearly twice as long as ours.