Chikayo Nagashima holds the record for the longest reign, at 395 days.
Academy Awards | United States Military Academy | Russian Academy of Sciences | National Academy of Sciences | American Academy of Arts and Sciences | Academy Award for Best Foreign Language Film | United States Naval Academy | World Rally Championship | United States Air Force Academy | Royal Academy of Music | World Championship | NCAA Men's Division I Basketball Championship | Ultimate Fighting Championship | World Championship Wrestling | Academy of Motion Picture Arts and Sciences | Brooklyn Academy of Music | Phillips Academy | Royal Military Academy Sandhurst | Phillips Exeter Academy | Chinese Academy of Sciences | British Academy of Film and Television Arts | National Academy of Engineering | World Touring Car Championship | Pennsylvania Academy of the Fine Arts | Academy of Fine Arts | Six Nations Championship | County Championship | British Touring Car Championship | British Academy | Academy Award for Best Picture |