The US President can serve a maximum two full terms. One term is four years.
A president who finishes another president's term which has less than two years to go, can still serve two more full terms. Therefore, in theory, it is possible to serve for 10 years in this special case.
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Grover Cleveland is the only US president to serve two non-consecutive (or two interrupted) terms of office.
Franklin Roosevelt was the only President to serve 3 terms in the US
if a US President is elected for 2 terms he will serve 8 years unless he resigns, dies, or becomes unable to perform his duties. A vice-president (or other official) who succeeds an elected president may serve for up to 2 years without forfeiting eligibility to two elected terms. So a President can serve a maximum of 10 years under the law set forth in the 22nd Amendment.
The president of the US isn't appointed ... rather, elected. A maximum of two terms (8 years) is all they can serve in that office.
James Carter served as US president for one term, from 1977 to 1981.