How often are US Supreme Court justices chosen?

According to Article III of the US Constitution, Supreme Court justices hold their offices "during good behavior," meaning for life, as long as they don't commit an impeachable offense. Qualifying infractions are defined in Article II, Section 4, as "treason, bribery, or other high crimes and misdemeanors."

Jon Roland, of The Constitution Society, explains "high crimes and misdemeanors":

"It refers to those punishable offenses that only apply to high persons, that is, to public officials, those who, because of their official status, are under special obligations that ordinary persons are not under, and which could not be meaningfully applied or justly punished if committed by ordinary persons."

For more detailed information, see Related Questions, below.