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How long is 0.9 decades?

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It's about one-and-one-tenth times as long as The Revolutionary War (American).
In other words, 0.9 decades is 1.074 times the length of The Revolutionary War (American), and the length of The Revolutionary War (American) is 0.9311 times that amount.
(a.k.a. American War of Independence) (1775-83)
It's about nine-tenths as long as King Tut's reign.
In other words, the length of King Tut's reign is 1 times 0.9 decades.
(a.k.a. Tutankhamun, a.k.a. Tutankhaten, a.k.a. tVwa:t-ʕa:nəx-ʔaˡma:n) (1333 BCE - 1324 BCE)
It's about three-fourths as long as FDR's Presidential Term.
In other words, 0.9 decades is 0.7433 times the length of FDR's Presidential Term, and the length of FDR's Presidential Term is 1.345 times that amount.
(a.k.a. Franklin Roosevelt, a.k.a. Franklin Delano Roosevelt) (1933-45)
FDR, the 32nd President of the United States, served from March 4th, 1933 to April 12th, 1945, dying after 1.211 decades in office. At the time of his sudden death, Elizabeth Shoumatoff was painting a portrait of Roosevelt which, never finished, now hangs in a museum at the site of Roosevelt's Presidential retreat in Georgia.
It's about one-and-two-fifths times as long as The Construction of the Chunnel.
In other words, 0.9 decades is 1.409 times the length of The Construction of the Chunnel, and the length of The Construction of the Chunnel is 0.7097 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 0.6382 decades. 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-a-half times as long as World War II.
In other words, 0.9 decades is 1.499 times the length of World War II, and the length of World War II is 0.6671 times that amount.
(a.k.a. Second World War, a.k.a. WWII, a.k.a. WW2) (1939 - 1945)
It's about two times as long as World War I.
In other words, 0.9 decades is 2.06 times the length of World War I, and the length of World War I is 0.485 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)
It's about two times as long as The First walk around the world.
In other words, 0.9 decades is 2.096 times the length of The First walk around the world, and the length of The First walk around the world is 0.4771 times that amount.
(1970 - 1974) (Dave, John, and Peter Kunst) (including time in recovery)