Who are the 10 longest reigning popes?

Answer 1

1. Pius IX (1846-1878): 31 years, 7 months and 23 days (11,560 days).
2. John Paul II (1978-2005): 26 years, 5 months and 18 days (9,665 days).
3. Leo XIII (1878-1903): 25 years, 5 months and 1 day (9,281 days).
4. Pius VI (1775-1799): 24 years, 6 months and 15 days (8,962 days).
5. Adrian I (772-795): 23 years, 10 months and 25 days (8,729 days).
6. Pius VII (1800-1823): 23 years, 5 months and 7 days (8,560 days).
7. Alexander III (1159-1181): 21 years, 11 months and 24 days (8,029 days).
8. St. Sylvester I (314-335): 21 years, 11 months and 1 day (8,005 days).
9. St. Leo I (440-461): 21 years, 1 month, and 13 days. (7,713 days).
10. Urban VIII (1623-1644): 20 years, 11 months and 24 days (7,664 days).

Saint Peter is thought to have reigned for over 30 years (AD 29 - 64?/67?), but the exact length is not reliably known.