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

The maximum number of years a president can serve is ten years. This is due to the 22nd Amendment to the United States Constitution, which was ratified in 1951. The amendment limits a person to two elected terms in office, which totals eight years. However, it also allows a president who has served less than two years of a term to be elected for an additional two full terms, potentially resulting in a total of ten years. For example, if a vice president assumes the presidency and serves for a year and a half before winning two subsequent elections, that individual could serve for ten years. This provision was established to prevent any one individual from holding too much power for an extended period.