A U.S. president can serve a maximum of two elected terms, each term lasting four years, for a total of eight years in office according to the 22nd Amendment to the U.S. Constitution, ratified in 1951

. However, there is an exception related to succession: if a vice president or another successor assumes the presidency and serves two years or less of the predecessor's term, that person can still be elected to two full terms, potentially allowing them to serve up to ten years in total. If the successor serves more than two years of the predecessor’s term, they can only be elected once more, limiting their total elected terms to one plus the remainder of the predecessor’s term

. In summary:

• Maximum of two elected terms (8 years).
• Possible to serve up to 10 years if succeeding a president mid-term under specific conditions.

No president can be elected more than twice, and this limit has been respected since the amendment's ratification