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How long is 72.1 months?

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It's about as long as World War II.
In other words, the length of World War II is 1 times 72.1 months.
(a.k.a. Second World War, a.k.a. WWII, a.k.a. WW2) (1939 - 1945)
It's about nine-tenths as long as The Construction of the Chunnel.
In other words, 72.1 months is 0.9399 times the length of The Construction of the Chunnel, and the length of The Construction of the Chunnel is 1.064 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)
The construction crew of the Chunnel broke ground in England on December 15th, 1987 and the tunnel was inaugurated by the Queen of England and the President of France on May 6th, 1994 — a total construction time of 76.63 months. The 4.9 million cubic meters of chalk excavated from the UK side of the Chunnel was dumped within sea walls to create the 299,467.38 sq. km (74 acre) Samphire Hoe County Park near Dover, Kent.
It's about one-and-two-fifths times as long as World War I.
In other words, 72.1 months is 1.37 times the length of World War I, and the length of World War I is 0.73 times that amount.
(a.k.a. First World War, a.k.a. Great War, a.k.a. World War, a.k.a. War to End All Wars, a.k.a. WWI, a.k.a. WW1) (1914 - 1918)
World War I is considered to have begun with the assassination of Austrian Archduke Franz Ferdinand on June 28th, 1914 and to have lasted until the signing of the armistice with Germany on November 11th, 1918, for a total of 52.5 months. However, the Treaty of Versailles which ended conflicts between the major powers was not signed until June 28th, 1919 and the last formal peace treaties were not signed until August 23rd, 1923 — 57.4 months after the armistice was signed.
It's about seven-tenths as long as The Revolutionary War (American).
In other words, 72.1 months is 0.7166 times the length of The Revolutionary War (American), and the length of The Revolutionary War (American) is 1.395 times that amount.
(a.k.a. American War of Independence) (1775-83)
It's about one-and-two-fifths times as long as The First walk around the world.
In other words, 72.1 months is 1.398 times the length of The First walk around the world, and the length of The First walk around the world is 0.7153 times that amount.
(1970 - 1974) (Dave, John, and Peter Kunst) (including time in recovery)
It's about one-and-a-half times as long as The Civil War (American).
In other words, the length of The Civil War (American) is 0.667 times 72.1 months.
(a.k.a. War Between the States, a.k.a. the Great Rebellion, a.k.a. the War of the Rebellion) (1861-65) (United States)
It's about three-fifths as long as King Tut's reign.
In other words, the length of King Tut's reign is 2 times 72.1 months.
(a.k.a. Tutankhamun, a.k.a. Tutankhaten, a.k.a. tVwa:t-ʕa:nəx-ʔaˡma:n) (1333 BCE - 1324 BCE)