Who has had the longest term as president?

skip to 2nd paragrph for answer With a few exceptions, Presidential terms have always lasted 1,461 days (the length of four years). However, George Washington's first term was 57 days shorter because the first inaugural was delayed, and Franklin Roosevelt's first term was shorter by 43 days because inauguration day was moved from March 4 (the day he became President in 1933) to January 20 (the day he was re-sworn in in 1937). The only other exceptions have been the terms of John Adams (1797-1801) which was only 1,460 days due to 1800 not being a leap year, and the first term to which McKinley was elected (1897-1901) which was also only 1,460 days due to 1900 not being a leap year. If you simply meant who held the office the longest, the answer is Franklin Roosevelt, who was elected four times and was president for more than 12 years from his first inauguration on March 4, 1933, until his death on April 12, 1945 (he served a total of 4,422 days). No other president has served more than 8 years or been elected to the office more than twice. Per the Twenty-Second Amendment, no one may be elected President more than twice, nor elected more than once if they serve more than half of a term to which someone else has been elected. This would seem to limit any future Presidents to serving a maximum of ten years, so Franklin Roosevelt's record will likely stand at least until the repeal or modification of the Twenty-Second Amendment.