It's about one-five-thousandth as long as The Voyage of the Mayflower.
In other words, 20 minutes is 0.00021 times the length of The Voyage of the Mayflower, and the length of The Voyage of the Mayflower is 4,800 times that amount.(1620)
Having left Southampton, England on September 16th (new style), 1620, the Mayflower dropped anchor near Cape Cod, Massachusetts 95,000 minutes 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-five-thousandth as long as Columbus' voyage to America.
In other words, the length of Columbus' voyage to America is 5,000 times 20 minutes.(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 — 100,000 minutes 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-six-thousand-five-hundredth as long as The First spaceflight (Sputnik).
In other words, the length of The First spaceflight (Sputnik) is 6,700 times 20 minutes.(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 130,000 minutes. During its voyage, it traveled about 70,000,000 km (43,495,983.46 mi), completing an orbit of the planet every 96.2 minutes.
It's about one-eight-thousandth as long as The Spanish-American War.
In other words, 20 minutes is 0.000127 times the length of The Spanish-American War, and the length of The Spanish-American War is 7,870 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, 156,000 minutes. The Treaty gave the United States control of Cuba, the Philippines, Puerto Rico, and Guam.
It's about one-eight-thousandth as long as The First artificial heart patient's survival.
In other words, 20 minutes is 0.000124 times the length of The First artificial heart patient's survival, and the length of The First artificial heart patient's survival is 8,060 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 161,000 minutes. 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 one-eighty-thousandth as long as The Korean War.
In other words, 20 minutes is 0.000012310 times the length of The Korean War, and the length of The Korean War is 81,230 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 — 1,624,000 minutes — although the war is officially ongoing and marked by occasional border conflicts.
It's about one-one-hundred-thousandth as long as The Civil War (American).
In other words, 20 minutes is 0.000009520 times the length of The Civil War (American), and the length of The Civil War (American) is 105,000 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 — 2,100,000 minutes. A total of 620,000 American (including Confederate) soldiers are estimated to have lost their lives due to the war.