How many days does Mars take to make 1 revolution around the sun?

"Mars takes 686.971 Earth days to orbit the Sun. That means that one Martian year is equal to 1.88 Earth years."

"If you were standing on Mars, a year would take 668.5921 sols. In other Words, Mars rotates 668.5921 during one orbit about the Sun."

Also, it is interesting to know the length of a day on Mars:

"A sidereal day on Mars is the length of time that it takes the planet to rotate once on its axis. A sidereal day on Mars lasts 24 hours 37 minutes and 22 seconds. The solar day is how long it takes the Sun to return to the meridian. This position changes slightly each day, but a solar day on Mars lasts 24 hours 39 minutes and 35 seconds."