His was the tenth shortest of all Popes and the shortest in modern history.
Urban VII (September 15–September 27, 1590): reigned for 13 calendar days, died before consecration.
Boniface VI (April, 896): reigned for 16 calendar days
Celestine IV (October 25–November 10, 1241): reigned for 17 calendar days, died before consecration.
Theodore II (December, 897): reigned for 20 calendar days
Sisinnius (January 15–February 4, 708): reigned for 21 calendar days
Marcellus II (April 9–May 1, 1555): reigned for 22 calendar days
Damasus II (July 17–August 9, 1048): reigned for 24 calendar days
Pius III (September 22–October 18, 1503): reigned for 27 calendar days.
Leo XI (April 1–April 27, 1605): reigned for 27 calendar days
Benedict V (May 22–June 23, 964): reigned for 33 calendar days.
John Paul I (August 26–September 28, 1978): reigned for 33 calendar days.
His successor Pope John Paul II had the Third longest reign
Saint Peter (30–64 or 67): 34 or 37 years.
Pius IX (1846–1878): 31 years, 7 months and 23 days (11,560 days).
John Paul II (1978–2005): 26 years, 5 months and 17 days (9,665 days)
Leo XIII (1878–1903): 25 years, 5 months and 1 day (9,281 days).
Pius VI (1775–1799): 24 years, 6 months and 15 days (8,962 days).
Adrian I (772–795): 23 years, 10 months and 25 days (8,729 days).
Pius VII (1800–1823): 23 years, 5 months and 7 days (8,560 days).
Alexander III (1159–1181): 21 years, 11 months and 24 days (8,029 days).
St. Sylvester I (314–335): 21 years, 11 months and 1 day (8,005 days).
St. Leo I (440–461): 21 years, 1 month, and 13 days. (7,713 days).
Urban VIII (1623–1644): 20 years, 11 months and 24 days (7,664 days).
Vulcan Stev's Database 