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How long is 15 days?

It's about as long as Boniface VI's reign
The length of Boniface VI's reign is about 15 days.
(AD 896)
The Church's enigmatic, shortest-reigning Pope, Boniface VI was pontiff for a period of fifteen days in AD 896 before dying under somewhat mysterious circumstances. His election was subsequently pronounced null by Pope John IX because Boniface had been previously defrocked while serving as a Roman priest.
It's about one-and-four-fifths times as long as The Apollo 11 Mission
The length of The Apollo 11 Mission is about 8.137910 days.
(1969) (total mission length)
The first trip by humans to the surface of the Moon, the Apollo 11 Mission began with the launch of the spacecraft from the Kennedy Space Center in Florida on July 16th, 1969 and concluded with the return of the command module on July 24th, 1969 — a total mission time of 8.137910 days. The total time spent by astronauts Neil Armstrong and Edwin "Buzz" Aldrin on the Moon's surface was 0.1087960 days.
It's about half as long as a William Henry Harrison's Presidency
The length of a William Henry Harrison's Presidency is about 31.520 days.
(a.k.a. William Henry Harrison, a.k.a. "Tippecanoe," a.k.a. "Old Tippecanoe") (1841)
Having caught pneumonia and pleurisy early in his term as President of the United States, William Henry Harrison died after 31.520 days minutes in office. Following his death, Congress approved a Presidential widow's pension for Harrison's wife, Anna Symmes, who received a year's worth of Harrison's presidential salary — $25,000 — and the right to free postage for the remainder of her life.
It's about three-and-a-half times as long as The Voyage of the Titanic
The length of The Voyage of the Titanic is about 4.5970 days.
(a.k.a. RMS Titanic) (1912) (from Southampton, Hampshire, England to near the Grand Banks of Newfoundland)
4.5970 days into its maiden voyage, the RMS Titanic had completely sunk after colliding with an iceberg. The sinking was one of the deadliest maritime disasters in peacetime history, resulting in the deaths of 1,517 passengers and crew.
It's about three-tenths as long as The First US Continental Congress
Flag of The US
The length of The First US Continental Congress is about 51 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 1 month, 3 weeks. Of the thirteen original American colonies in existence at the time, only the Province of Georgia sent no delegates to the Congress.
It's about one-fourth as long as The Voyage of the Mayflower
The length of The Voyage of the Mayflower is about 66 days.
(1620)
Having left Southampton, England on September 16th (new style), 1620, the Mayflower dropped anchor near Cape Cod, Massachusetts 66 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 one-fifth as long as Columbus' voyage to America
The length of Columbus' voyage to America is about 70 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 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 six times as long as The Great Chicago Fire
Flag of The US
The length of The Great Chicago Fire is about 2 days.
(1871) (Chicago, Illinois)
The Great Chicago Fire started at about 9am and burned for two days between October 8th and October 10th, 1871. Chicago had experienced twenty smaller fires in the 10 days leading up to the blaze, due to drought conditions, strong winds, and the abundance of wooden buildings at the time.
It's about one-fifth as long as The First spaceflight (Sputnik)
The length of The First spaceflight (Sputnik) is about 91 days.
(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 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 days.
It's about one-tenth as long as The Spanish-American War
The length of The Spanish-American War is about 109 days.
(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, 3 months, 2 weeks, and 4 days later. The Treaty gave the United States control of Cuba, the Philippines, Puerto Rico, and Guam.
It's about one-tenth as long as The First artificial heart patient's survival
The length of The First artificial heart patient's survival is about 112 days.
(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 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 eleven times as long as The Battle of Fort Sumter
Flag of The US
The length of The Battle of Fort Sumter is about 1.40 days.
(1861)
The first battle of the American Civil War, the Battle of Fort Sumter began with the shelling of the Fort at 4:30 am on April 12th, 1861 and concluded with the surrender of the Fort by its Commander Robert Anderson at about 1:30pm on April 13th, 1.40 days later. The Battle's only casualties were the accidental shootings of two Union soldiers during the surrender ceremony.
It's about twenty times as long as The First Transatlantic Flight (Alcock and Brown, 1919)
The length of The First Transatlantic Flight (Alcock and Brown, 1919) is about 0.6750 days.
(John Alcock and Arthur Whitten Brown) (1919) (first non-stop flight)
In an effort to win a £10,000 prize from London's The Daily Mail, John Alcock and Arthur Brown completed a flight from St. John's, Newfoundland to Connemara, Ireland in 0.6750 days in June, 1919. In spite of their fame as aviators, Brown would never fly again after this trip and Alcock would lose his life during a flight to France less than 183 days later.
It's about twenty times as long as The First light bulb test (Edison, 1879)
The length of The First light bulb test (Edison, 1879) is about 0.6040 days.
(Thomas Edison's filament Thread No. 9) (1879) (total time)
Lit at 1:30am on October 22nd, 1879, the first Edison completed his first majorly successful test of his light bulb, which continued to burn for 0.6040 days until the bulb glass succumbed to the heat and cracked, extinguishing the filament. Within 1,100 days of his success, Edison was selling 45,000 light bulbs per day to large companies across the country.
It's about 45 times as long as The Longest Pro Baseball Game
The length of The Longest Pro Baseball Game is about 0.3510 days.
(1981) (McCoy Stadium, Pawtucket, Rhode Island)
The longest professional baseball game in history — a triple-A game between the Pawtucket Red Sox and the Rochester Red Wings — took place between April 18th and 19th, 1981 lasting a total of 0.350 days (and 33 innings). The Red Sox ultimately won the game 3-2, but not before the game set twelve records, including the most plate appearances by a single player - a three-way tie between Tom Eaton, Dallas Williams, and future Hall-of-Famer Cal Ripken Jr., all of Rochester.
 
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