It's about one-and-one-fifth times as long as Pius IX's reign.
In other words, 37.5 years is 1.185 times the length of Pius IX's reign, and the length of Pius IX's reign is 0.8439 times that amount.(a.k.a. Pope Blessed Pius IX, a.k.a. Giovanni Maria Mastai-Ferretti) (1792-1878)
The longest reigning Pope in the Church's history, Pius IX reigned from June 16th, 1846 to February 7th, 1878 — 31.65 years. As the last monarchical Pope, he ruled over 3,000,000 subjects in the Papal States until 1870.
It's about two-fifths as long as Pepi II's reign.
In other words, the length of Pepi II's reign is 3 times 37.5 years.(a.k.a. Neferkare) (2278 BCE - 2184 BCE)
It's about three times as long as FDR's Presidential Term.
In other words, 37.5 years is 3.097 times the length of FDR's Presidential Term, and the length of FDR's Presidential Term is 0.3229 times that amount.(a.k.a. Franklin Roosevelt, a.k.a. Franklin Delano Roosevelt) (1933-45)
It's about four times as long as King Tut's reign.
In other words, the length of King Tut's reign is 0.3 times 37.5 years.(a.k.a. Tutankhamun, a.k.a. Tutankhaten, a.k.a. tVwa:t-ʕa:nəx-ʔaˡma:n) (1333 BCE - 1324 BCE)
It's about four-and-a-half times as long as The Revolutionary War (American).
In other words, 37.5 years is 4.476 times the length of The Revolutionary War (American), and the length of The Revolutionary War (American) is 0.2234 times that amount.(a.k.a. American War of Independence) (1775-83)
The War between Great Britain and the its thirteen colonies in North America (now the United States) for the independence of the United States is generally considered to have started with the Battle of Lexington and Concord on April 18th, 1775 (sometimes known as "The Shot Heard 'round the World") and to have concluded with the signing of the Treaty of Paris on September 3rd, 1783 — 8.378 years. A total of 25,000 Americans are estimated to have died as a result of the war.
It's about six times as long as The Construction of the Chunnel.
In other words, 37.5 years is 5.87 times the length of The Construction of the Chunnel, and the length of The Construction of the Chunnel is 0.1704 times that amount.(a.k.a. Channel Tunnel, a.k.a. Le tunnel sous la Manche) (1987 thru 1994) (Folkstone, Kent, UK to Coquelles, Pas-de-Calais, France)
It's about six times as long as World War II.
In other words, 37.5 years is 6.245 times the length of World War II, and the length of World War II is 0.1601 times that amount.(a.k.a. Second World War, a.k.a. WWII, a.k.a. WW2) (1939 - 1945)