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How long is 256 sidereal days?

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It's about two-and-a-half times as long as The First artificial heart patient's survival.
In other words, 256 sidereal days is 2.280 times the length of The First artificial heart patient's survival, and the length of The First artificial heart patient's survival is 0.4390 times that amount.
(1982) (Dr. Barney Bailey Clark; first permanent, pneumatic device)
On December 2nd, 1982 Dr. William DeVries implanted the first artificial heart into Dr. Barney Bailey Clark, who went on to live for 112 sidereal days. This early model of the artificial heart was controlled and powered by an external, 146.51 kg (323 lb) machine that Dr. Clark had to cart with him as he moved throughout the hospital.
It's about two-and-a-half times as long as The Spanish-American War.
In other words, 256 sidereal days is 2.340 times the length of The Spanish-American War, and the length of The Spanish-American War is 0.4270 times that amount.
(1898)
The War between Spain and the United States over the liberation of Cuba began on April 25th, 1898 and lasted until the signing of the Treaty of Paris on August 12th, 1898, 108 sidereal days. The Treaty gave the United States control of Cuba, the Philippines, Puerto Rico, and Guam.
It's about three times as long as The First spaceflight (Sputnik).
In other words, 256 sidereal days is 2.80 times the length of The First spaceflight (Sputnik), and the length of The First spaceflight (Sputnik) is 0.360 times that amount.
(a.k.a. Sputnik 1, a.k.a. Спутник-1, a.k.a. "Satellite-1", a.k.a. Простейший Спутник-1) (1957) (total time in orbit)
Launched from Kazakhstan in 1957, Sputnik was the first artificial satellite placed into orbit around Earth, where it remained for 92 sidereal days. During its voyage, it traveled about 70,000,000 km (43,495,983.46 mi), completing an orbit of the planet every 0.067 sidereal days.
It's about four times as long as The Voyage of the Mayflower.
In other words, 256 sidereal days is 3.90 times the length of The Voyage of the Mayflower, and the length of The Voyage of the Mayflower is 0.260 times that amount.
(1620)
Having left Southampton, England on September 16th (new style), 1620, the Mayflower dropped anchor near Cape Cod, Massachusetts 66 sidereal days later on November 21st (new style), 1620. The voyagers had planned to travel in a convoy of two ships, but the smaller Speedwell was found to be leaking (evidently as a result of sabotage) and all passengers had to be moved to the Mayflower instead.
It's about four times as long as Columbus' voyage to America.
In other words, the length of Columbus' voyage to America is 0.30 times 256 sidereal days.
(1492) (first voyage)
Attempting to find a western route to Asia, Christopher Columbus set sail on August 3rd, 1492 and landed in the Bahamas on October 12th — 70 sidereal days later. After one of Columbus' ships, the Santa Maria ran aground in present-day Haiti, he ordered that the timber be used to used to build a fort and settlement called La Navidad; it remains missing to archaeologists to this day.
It's about one-fourth as long as The Korean War.
In other words, 256 sidereal days is 0.22630 times the length of The Korean War, and the length of The Korean War is 4.4190 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 — 1,131 sidereal days — although the war is officially ongoing and marked by occasional border conflicts.
It's about five times as long as The First US Continental Congress.
In other words, the length of The First US Continental Congress is 0.20 times 256 sidereal days.
(1774) (Philadelphia, Pennsylvania)
The First Continental Congress — which included such notable members as Samuel Adams, Thomas Paine, Patrick Henry, John Jay and George Washington — met from September 5th to October 26th, 1774 — a total of 51 sidereal days. Of the thirteen original American colonies in existence at the time, only the Province of Georgia sent no delegates to the Congress.