It's about one-seven-hundred-fifty-thousandth as long as The Voyage of the Mayflower
In other words, the length of The Voyage of the Mayflower is 770,000 times 7.40 seconds.(1620)
Having left Southampton, England on September 16th (new style), 1620, the Mayflower dropped anchor near Cape Cod, Massachusetts 5,700,000 seconds 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-one-millionth as long as Columbus' voyage to America
In other words, 7.40 seconds is 0.000001000 times the length of Columbus' voyage to America, and the length of Columbus' voyage to America is 1,000,000 times that amount.(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 — 6,000,000 seconds 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 0.0000010 times as long as The First spaceflight (Sputnik)
In other words, 7.40 seconds is 0.000000940 times the length of The First spaceflight (Sputnik), and the length of The First spaceflight (Sputnik) is 1,100,000 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 7,900,000 seconds. During its voyage, it traveled about 70,000,000 km (43,495,983.46 mi), completing an orbit of the planet every 5,800 seconds.
It's about 0.0000008 times as long as The Spanish-American War
In other words, 7.40 seconds is 0.0000007860 times the length of The Spanish-American War, and the length of The Spanish-American War is 1,270,000 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, 9,330,000 seconds. The Treaty gave the United States control of Cuba, the Philippines, Puerto Rico, and Guam.
It's about 0.0000008 times as long as The First artificial heart patient's survival
In other words, 7.40 seconds is 0.0000007640 times the length of The First artificial heart patient's survival, and the length of The First artificial heart patient's survival is 1,310,000 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 9,680,000 seconds. 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 0.00000008 times as long as The Korean War
In other words, 7.40 seconds is 0.000000075930 times the length of The Korean War, and the length of The Korean War is 13,170,000 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 — 97,460,000 seconds — although the war is officially ongoing and marked by occasional border conflicts.
It's about 0.00000006 times as long as The Civil War (American)
In other words, 7.40 seconds is 0.00000005870 times the length of The Civil War (American), and the length of The Civil War (American) is 17,000,000 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 — 126,000,000 seconds. A total of 620,000 American (including Confederate) soldiers are estimated to have lost their lives due to the war.