The terms of the President and Vice President are set at four years by Article II, Section 1 of the Constitution. The 20th Amendment, ratified in 1933, sets the expiration date of these terms at noon on January 20 of each year following a presidential election. From 1789 to 1940, chief executives adhered to a self-imposed limit of two terms, although only 7 of the 31 Presidents from 1789 through 1933 actually served two consecutive terms in office. The precedent was exceeded only once, by President Franklin D. Roosevelt, who was elected to four terms, and served from 1933 through 1945.