FDR
Many, the last was George Bush Jr.
Since Franklin D. Roosevelt, no US President has served more than eight years.
George Washington served as a president for eight years.
A president serves four years in a term. Theodore Roosevelt was elected to two terms, so therefore, he served as president for eight years.
George H.W. Bush served as the 41st President for only four years from 1989 to 1993. However, he served as vice president under Ronald Reagan for the eight years leading up to his own presidency.
James Madison served as president for eight years.
big ones
Grant took office on March 4,1869 and served for eight years.
A president serves four years, and if he is re-elected, he may serve another four years. Mr. Obama was elected in 2008, and re-elected in 2012. Under the constitution, a president may not serve more than that, so when he term officially ends in January of 2017, he will no longer be president, having served eight years.
Vice President Tompkins served the full eight years of James Monroe's presidency.
Gerald Ford was only president for 2 years and 5 months. Whoever told you he served longer than 8 years is incorrect.
John Adams served for eight years as the first Vice President (under George Washington) .He then went on to become the second US president.