It's about one-five-thousand-five-hundredth as long as The Battle of Fort Sumter
In other words, the length of The Battle of Fort Sumter is 5,600 times 21.340 seconds.(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, 120,000 seconds later. The Battle's only casualties were the accidental shootings of two Union soldiers during the surrender ceremony.
It's about one-ten-thousandth as long as The Great Chicago Fire
In other words, the length of The Great Chicago Fire is 10,000 times 21.340 seconds.(1871) (Chicago, Illinois)
The Great Chicago Fire started at about 9am and burned for 200,000 seconds between October 8th and October 10th, 1871. Chicago had experienced twenty smaller fires in the 1,000,000 seconds leading up to the blaze, due to drought conditions, strong winds, and the abundance of wooden buildings at the time.
It's about one-twenty-thousandth as long as The Voyage of the Titanic
In other words, 21.340 seconds is 0.000053730 times the length of The Voyage of the Titanic, and the length of The Voyage of the Titanic is 18,610 times that amount.(a.k.a. RMS Titanic) (1912) (from Southampton, Hampshire, England to near the Grand Banks of Newfoundland)
397,200 seconds 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 one-thirty-five-thousandth as long as The Apollo 11 Mission
In other words, 21.340 seconds is 0.00003035070 times the length of The Apollo 11 Mission, and the length of The Apollo 11 Mission is 32,948.20 times that amount.(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 1 weeks, 1 days, 3 hours, 18 minutes, and 35 seconds. The total time spent by astronauts Neil Armstrong and Edwin "Buzz" Aldrin on the Moon's surface was 2 hours, 36 minutes, and 40 seconds.
It's about one-sixty-five-thousandth as long as Boniface VI's reign
In other words, the length of Boniface VI's reign is 63,000 times 21.340 seconds.(AD 896)
The Church's enigmatic, shortest-reigning Pope, Boniface VI was pontiff for a period of 1,300,000 seconds 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-one-hundred-fifty-thousandth as long as a William Henry Harrison's Presidency
In other words, 21.340 seconds is 0.0000078370 times the length of a William Henry Harrison's Presidency, and the length of a William Henry Harrison's Presidency is 127,600 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 2,723,000 seconds 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-two-hundred-thousandth as long as The First US Continental Congress
In other words, 21.340 seconds is 0.00000490 times the length of The First US Continental Congress, and the length of The First US Continental Congress is 200,000 times that amount.(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 4,400,000 seconds. Of the thirteen original American colonies in existence at the time, only the Province of Georgia sent no delegates to the Congress.