Lyndon B. Johnson served one full term as the President of the United States. He initially assumed the presidency on November 22, 1963, following the assassination of President John F. Kennedy. Johnson was then elected in his own right in the 1964 presidential election and served until January 20, 1969.
Although Johnson was eligible to run for a second full term in 1968, he chose not to seek re-election due to the Vietnam War’s impact on his popularity and health concerns. Therefore, his total time in office was approximately five years and two months.