What is the maximum number of years a President can serve?

The maximum number of years a President can serve is determined by the 22nd Amendment to the United States Constitution, which limits an individual to two elected terms in office, totaling a maximum of eight years. However, there is a provision that allows a person who has completed the remainder of a term that was not their own to serve up to an additional two years if they assume the presidency mid-term. This means that if a Vice President or another individual steps into the role partway through a term, they could potentially serve up to ten years in total (if they fill out the remainder of someone else's term and then are elected to two full terms).

Therefore, while the standard term limit is eight years, the possibility of serving up to ten years exists under certain circumstances. This makes the correct answer ten years, reflecting the combined potential of completing a half-term and then serving two full terms as President.