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How long is 8.40 hours?

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It's about one-three-hundredth as long as The First artificial heart patient's survival.
In other words, 8.40 hours is 0.00312 times the length of The First artificial heart patient's survival, and the length of The First artificial heart patient's survival is 321 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 2,690 hours. 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 600 times as long as The San Francisco earthquake of 1906.
In other words, 8.40 hours is 576 times the length of The San Francisco earthquake of 1906, and the length of The San Francisco earthquake of 1906 is 0.00174 times that amount.
(1906) (Mussel Rock Fault, California) (sensible duration)
The San Francisco earthquake of 1906 caused perceptible shaking of the ground for about 0.0146 hours. The most devastating natural disaster in California's history, the quake was felt as far away and southern Oregon and western Nevada, and resulted in about 3,000 deaths, the displacement of 55% - 70% of the city's population, and the shifting of some spots of ground by up to 6 m (20 ft).
It's about 2,500 times as long as The First airplane flight (Wright Flyer, 1903).
In other words, the length of The First airplane flight (Wright Flyer, 1903) is 0.0004 times 8.40 hours.
(Wright Flyer) (1903)
The first successful airplane flight was made by Orville Wright on December 17th, 1903 and lasted 0.0033 hours, covering a horizontal distance of 37 m (121.39 ft). The stopwatch used by Orville and his brother Wilbur to time this flight is on display at the Smithsonian National Air and Space Museum in Washington, D.C.
It's about one-three-thousandth as long as The Korean War.
In other words, 8.40 hours is 0.0003103 times the length of The Korean War, and the length of The Korean War is 3,223 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 — 27,070 hours — although the war is officially ongoing and marked by occasional border conflicts.
It's about 4,000 times as long as a Pit Stop.
In other words, the length of a Pit Stop is 0.0003 times 8.40 hours.
(for IndyCar racing; optimal)
A well-executed, IndyCar racing pit stop takes just 0.002 hours. Changing all four tires takes about 0.0008 hours.
It's about one-four-thousandth as long as The Civil War (American).
In other words, 8.40 hours is 0.00024 times the length of The Civil War (American), and the length of The Civil War (American) is 4,170 times that amount.
(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 — 35,000 hours. A total of 620,000 American (including Confederate) soldiers are estimated to have lost their lives due to the war.
It's about one-four-thousand-five-hundredth as long as The First walk around the world.
In other words, 8.40 hours is 0.0002232 times the length of The First walk around the world, and the length of The First walk around the world is 4,480 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 2,920 hours pause following an assault he suffered during the journey) on October 5th, 1974 — 37,630 hours.