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A Year is defined as the time it take a planet to orbit its star once. As the Sun is the star round which our solar system's planets orbit, the Sun itself can not have a year as it can not orbit itself. Therefore there is no year length for the Sun.

However, the Sun, does revolve around the centre of the Milky Way Galaxy once ever ~235 million years - also called the Cosmic Year or Galactic year.
that is 235 million years

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