It's about half as long as FDR's Presidential Term.
In other words, 6.3820 years is 0.52710 times the length of FDR's Presidential Term, and the length of FDR's Presidential Term is 1.8970 times that amount.(a.k.a. Franklin Roosevelt, a.k.a. Franklin Delano Roosevelt) (1933-45)
FDR, the 32nd President of the United States, served from March 4th, 1933 to April 12th, 1945, dying after 12.110 years in office. At the time of his sudden death, Elizabeth Shoumatoff was painting a portrait of Roosevelt which, never finished, now hangs in a museum at the site of Roosevelt's Presidential retreat in Georgia.
It's about two times as long as The Korean War.
In other words, 6.3820 years is 2.066 times the length of The Korean War, and the length of The Korean War is 0.4840 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 — 3.088 years — although the war is officially ongoing and marked by occasional border conflicts.
It's about one-fifth as long as Pius IX's reign.
In other words, 6.3820 years is 0.20170 times the length of Pius IX's reign, and the length of Pius IX's reign is 4.9580 times that amount.(a.k.a. Pope Blessed Pius IX, a.k.a. Giovanni Maria Mastai-Ferretti) (1792-1878)
The longest reigning Pope in the Church's history, Pius IX reigned from June 16th, 1846 to February 7th, 1878 — 31.650 years. As the last monarchical Pope, he ruled over 3,000,000 subjects in the Papal States until 1870.
It's about one-fifteenth as long as Pepi II's reign.
In other words, the length of Pepi II's reign is 10 times 6.3820 years.(a.k.a. Neferkare) (2278 BCE - 2184 BCE)
The sixth dynasty pharaoh of Egypt's Old Kingdom, Pepi II Neferkare ascended to the throne at the age of six and is generally thought to have reigned until his death at the age of one-hundred — a total of 94 years. His reign was the longest of any monarch in history.
It's about 21 times as long as The First artificial heart patient's survival.
In other words, 6.3820 years is 20.80 times the length of The First artificial heart patient's survival, and the length of The First artificial heart patient's survival is 0.0481 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 0.3070 years. 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 twenty times as long as The Spanish-American War.
In other words, 6.3820 years is 21.40 times the length of The Spanish-American War, and the length of The Spanish-American War is 0.0467 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, 0.2960 years. The Treaty gave the United States control of Cuba, the Philippines, Puerto Rico, and Guam.
It's about thirty times as long as The First spaceflight (Sputnik).
In other words, the length of The First spaceflight (Sputnik) is 0.04 times 6.3820 years.(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 0.250 years. During its voyage, it traveled about 70,000,000 km (43,495,983.46 mi), completing an orbit of the planet every 0.00018 years.