It's about five-and-a-half times as long as World War I.
In other words, 611 fortnights is 5.36 times the length of World War I, and the length of World War I is 0.187 times that amount.(a.k.a. First World War, a.k.a. Great War, a.k.a. World War, a.k.a. War to End All Wars, a.k.a. WWI, a.k.a. WW1) (1914 - 1918)
World War I is considered to have begun with the assassination of Austrian Archduke Franz Ferdinand on June 28th, 1914 and to have lasted until the signing of the armistice with Germany on November 11th, 1918, for a total of 114 fortnights. However, the Treaty of Versailles which ended conflicts between the major powers was not signed until June 28th, 1919 and the last formal peace treaties were not signed until August 23rd, 1923 — 125 fortnights after the armistice was signed.
It's about five-and-a-half times as long as The First walk around the world.
In other words, 611 fortnights is 5.454 times the length of The First walk around the world, and the length of The First walk around the world is 0.1834 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 8.691 fortnights pause following an assault he suffered during the journey) on October 5th, 1974 — 112 fortnights.
It's about six times as long as The Civil War (American).
In other words, 611 fortnights is 5.87 times the length of The Civil War (American), and the length of The Civil War (American) is 0.17 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 — 104 fortnights. A total of 620,000 American (including Confederate) soldiers are estimated to have lost their lives due to the war.
It's about seven-and-a-half times as long as The Korean War.
In other words, 611 fortnights is 7.583 times the length of The Korean War, and the length of The Korean War is 0.1319 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 — 80.57 fortnights — although the war is officially ongoing and marked by occasional border conflicts.
It's about one-tenth as long as a Giant Tortoise's Lifespan.
In other words, the length of a Giant Tortoise's Lifespan is 11 times 611 fortnights.(for Adwaita, an Aldabra Giant Tortoise) (Dipsochelys dussumieri, formerly Geochelone gigantea)
Adwaita, an Aldabra Giant Tortoise who lived the later part of his life in the Alipore Zoological Gardens in Kolkata, India, was 6,500 fortnights at the time of his death. Once a pet of Major-General Robert Clive, 1st Baron Clive, who is credited with securing India as a colony of Great Britain, Adwaita lived through the entirety of India's 5,000 fortnights as a British colony.
It's about 75 times as long as The First artificial heart patient's survival.
In other words, 611 fortnights is 76.3 times the length of The First artificial heart patient's survival, and the length of The First artificial heart patient's survival is 0.0131 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 8 fortnights. 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 80 times as long as The Spanish-American War.
In other words, 611 fortnights is 78.5 times the length of The Spanish-American War, and the length of The Spanish-American War is 0.0127 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, 7.71 fortnights. The Treaty gave the United States control of Cuba, the Philippines, Puerto Rico, and Guam.