List of United States Supreme Court justices by time in office

A total of 116 people have served on the Supreme Court of the United States, the highest judicial body in the United States, since it was established in 1789. Supreme Court justices have life tenure, meaning that they serve until they die, resign, retire, or are impeached and removed from office. For the 107 non-incumbent justices, the average length of service was 6,203 days. The longest serving justice was William O. Douglas, with a tenure of 13,358 days. The longest serving chief justice was John Marshall, with a tenure of 12,570 days. John Rutledge, who served on the court twice, was both the shortest serving associate justice, with a tenure of 383 days, and the shortest serving chief justice, with a tenure of 138 days. Among the current members of the court, Clarence Thomas' tenure of 12,674 days is the longest, while Ketanji Brown Jackson's 1,466 days is the shortest.