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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 (16 years, 359 days). The longest serving justice was William O. Douglas, with a tenure of 13,358 days (36 years, 209 days).
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