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Planets orbit the Sun while moons orbit around planets. The amount of time required for a planet or moon to complete one orbit around another body is called an orbital period. On Earth, we call this orbital period a year. Our year is 365.256 days. On Mars it takes 686.98 days (Earth days, that is) to complete one orbit about the Sun--that's a long time to wait between birthdays!
Since we define a day as having exactly 24 hours, the rotation period of the Earth is 23 hours 56 minutes, as shown in the table. The Rotation Periods of the Outer Planets