It's about one-forty-fifth as long as Boniface VI's reign.
In other words, the length of Boniface VI's reign is 43 times 8.40 hours.(AD 896)
The Church's enigmatic, shortest-reigning Pope, Boniface VI was pontiff for a period of 360 hours 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-ninetieth as long as a William Henry Harrison's Presidency.
In other words, 8.40 hours is 0.01111 times the length of a William Henry Harrison's Presidency, and the length of a William Henry Harrison's Presidency is 90.01 times that amount.(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 756.50 hours 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 one-one-hundred-fiftieth as long as The First US Continental Congress.
In other words, the length of The First US Continental Congress is 140 times 8.40 hours.(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 1,200 hours. 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-two-hundredth as long as The Voyage of the Mayflower.
In other words, 8.40 hours is 0.0053 times the length of The Voyage of the Mayflower, and the length of The Voyage of the Mayflower is 190 times that amount.(1620)
Having left Southampton, England on September 16th (new style), 1620, the Mayflower dropped anchor near Cape Cod, Massachusetts 1,600 hours 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-two-hundredth as long as Columbus' voyage to America.
In other words, the length of Columbus' voyage to America is 200 times 8.40 hours.(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 — 2,000 hours 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-two-hundred-fiftieth as long as The First spaceflight (Sputnik).
In other words, the length of The First spaceflight (Sputnik) is 260 times 8.40 hours.(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 2,200 hours. During its voyage, it traveled about 70,000,000 km (43,495,983.46 mi), completing an orbit of the planet every 1.60 hours.
It's about one-three-hundredth as long as The Spanish-American War.
In other words, 8.40 hours is 0.00321 times the length of The Spanish-American War, and the length of The Spanish-American War is 312 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, 2,590 hours. The Treaty gave the United States control of Cuba, the Philippines, Puerto Rico, and Guam.