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How long is 0.004 years?

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It's about 200 times as long as The First spacewalk
In other words, 0.004 years is 180 times the length of The First spacewalk, and the length of The First spacewalk is 0.0056 times that amount.
(1965) (Alexi Lenovo, a.k.a. Алексе́й Архи́пович Лео́нов)
On March 18th, 1965, during the Voskhod 2 Soviet space mission, cosmonaut Alexey Arkhipovich Leonov conducted the first human spacewalk, which lasted 0.0000230 years. The total mission length was 0.003 years.
It's about one-seven-hundred-fiftieth as long as The Korean War
In other words, 0.004 years is 0.001295 times the length of The Korean War, and the length of The Korean War is 772.20 times that amount.
(1951-53) (to armistice signing)
The Korean War between North Korea (a.k.a. Democratic People's Republic of Korea, a.k.a. DPRK) and South Korea (a.k.a. Republic of Korea, a.k.a. ROK) began on June 25th, 1950 during the Cold War. The war paused with the signing of an armistice on July 27th, 1953 — 3.088 years — although the war is officially ongoing and marked by occasional border conflicts.
It's about one-one-thousandth as long as The Civil War (American)
In other words, the length of The Civil War (American) is 1,000 times 0.004 years.
(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)
The deadliest war in American history, the American Civil War is generally considered to have begun on with the attack on Fort Sumter on April 12th, 1861 and to have lasted until the surrender of Robert E. Lee's army on April 9th, 1865 — 3.990 years. A total of 620,000 American (including Confederate) soldiers are estimated to have lost their lives due to the war.
It's about one-one-thousandth as long as The First walk around the world
In other words, 0.004 years is 0.0009316 times the length of The First walk around the world, and the length of The First walk around the world is 1,073 times that amount.
(1970 - 1974) (Dave, John, and Peter Kunst) (including time in recovery)
On June 20th, 1970, Dave Kunst set out from Waseca, Minnesota with $1,000 and a mule. Kunst completed his walk around the world (with a 0.33310 years pause following an assault he suffered during the journey) on October 5th, 1974 — 4.2930 years.
It's about one-one-thousandth as long as World War I
In other words, 0.004 years is 0.000915 times the length of World War I, and the length of World War I is 1,090 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 4.370 years. 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 — 4.780 years after the armistice was signed.
It's about one-one-thousand-five-hundredth as long as World War II
In other words, 0.004 years is 0.0006661 times the length of World War II, and the length of World War II is 1,501 times that amount.
(a.k.a. Second World War, a.k.a. WWII, a.k.a. WW2) (1939 - 1945)
The most widespread war in history, the Second World War is generally considered to have started with the German invasion of Poland on September 1st, 1939 and to have until the surrender of Japan on September 2nd, 1945, a total of 6.004 years. Also the deadliest conflict in history, the war had an estimated 60 million casualties globally.
It's about one-one-thousand-five-hundredth as long as The Construction of the Chunnel
In other words, 0.004 years is 0.0006261 times the length of The Construction of the Chunnel, and the length of The Construction of the Chunnel is 1,597 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 6.3820 years. 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.