Two terms, which is eight years.
Fdr
bill clinton
Franklin D. Roosevelt.
The US President who served the longest as President was Franklin D. Rosevelt (1882-1945). He was President from March 4, 1933 until his death on April 12, 1945.The US President who lived to the oldest age was Gerald Ford (July 14, 1913 - December 26, 2006). He was 93. He was the 38th US President (1974-1977).The oldest living President in 2009 is George H. Bush (born June 12, 1924), the 41st US President.
Not sure about the longest Inauguration ceremony, because traditionally the programs are followed by parties for 5 days... But the Longest inaugural address (10,000 words) was given on March 4, 1841 -by President William H. Harrison
Franklin D. Roosevelt was the longest-serving president in the United States, serving for four terms from 1933 to 1945.
frederick delano roosevelt
When the US Vice President is absent or acting as President, his/her Senate duties fall to the US Senate President Pro Tempore, who by tradition is the longest-serving Senator of the majority party.
As of 2018, Jefferson had the 9th-longest lifespan of any US President, having died at the age of 83.
Franklin Delano Roosevelt March 4, 1933 - April 12, 1945
F.d.r
William Henry Harrison was president for 31 days in 1841. He died of pneumonia, which he came down with shortly after delivering his 1 hour and 40 minute long inaugural speech.