<P> William Henry Harrison spent the shortest time in office , and Franklin D. Roosevelt spent the longest . He is the only president to have served more than two terms . Following ratification of the 22nd Amendment in 1951 , presidents -- beginning with Dwight D. Eisenhower -- have been ineligible for election to a third term or for election to a second full term after serving more than two years of a term to which some other person was elected president . The amendment contained a grandfather clause that explicitly exempted the incumbent president -- then Harry S. Truman -- from the new term limitations . </P>
<P> William Henry Harrison spent the shortest time in office , and Franklin D. Roosevelt spent the longest . He is the only president to have served more than two terms . Following ratification of the 22nd Amendment in 1951 , presidents -- beginning with Dwight D. Eisenhower -- have been ineligible for election to a third term or for election to a second full term after serving more than two years of a term to which some other person was elected president . The amendment contained a grandfather clause that explicitly exempted the incumbent president -- then Harry S. Truman -- from the new term limitations . </P>
who was the president that served more than two terms
who was the president that served more than two terms
Franklin D. Roosevelt
Franklin D. Roosevelt