It's about 0.000000003 times as long as The First walk around the world
In other words, 0.40 seconds is 0.0000000029520 times the length of The First walk around the world, and the length of The First walk around the world is 338,800,000 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 10,510,000 seconds pause following an assault he suffered during the journey) on October 5th, 1974 — 135,500,000 seconds.
It's about 0.000000003 times as long as World War I
In other words, 0.40 seconds is 0.00000000290 times the length of World War I, and the length of World War I is 345,000,000 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 138,000,000 seconds. 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 — 151,000,000 seconds after the armistice was signed.
It's about 0.000000002 times as long as World War II
In other words, 0.40 seconds is 0.0000000021110 times the length of World War II, and the length of World War II is 473,700,000 times that amount.(a.k.a. Second World War, a.k.a. WWII, a.k.a. WW2) (1939 - 1945)
The most widespread war in history, the Second World War is generally considered to have started with the German invasion of Poland on September 1st, 1939 and to have until the surrender of Japan on September 2nd, 1945, a total of 189,500,000 seconds. Also the deadliest conflict in history, the war had an estimated 60 million casualties globally.
It's about 0.000000002 times as long as The Construction of the Chunnel
In other words, 0.40 seconds is 0.0000000019840 times the length of The Construction of the Chunnel, and the length of The Construction of the Chunnel is 504,000,000 times that amount.(a.k.a. Channel Tunnel, a.k.a. Le tunnel sous la Manche) (1987 thru 1994) (Folkstone, Kent, UK to Coquelles, Pas-de-Calais, France)
The construction crew of the Chunnel broke ground in England on December 15th, 1987 and the tunnel was inaugurated by the Queen of England and the President of France on May 6th, 1994 — a total construction time of 201,400,000 seconds. The 4.9 million cubic meters of chalk excavated from the UK side of the Chunnel was dumped within sea walls to create the 299,467.38 sq. km (74 acre) Samphire Hoe County Park near Dover, Kent.
It's about 0.000000002 times as long as The Revolutionary War (American)
In other words, 0.40 seconds is 0.0000000015130 times the length of The Revolutionary War (American), and the length of The Revolutionary War (American) is 660,900,000 times that amount.(a.k.a. American War of Independence) (1775-83)
The War between Great Britain and the its thirteen colonies in North America (now the United States) for the independence of the United States is generally considered to have started with the Battle of Lexington and Concord on April 18th, 1775 (sometimes known as "The Shot Heard 'round the World") and to have concluded with the signing of the Treaty of Paris on September 3rd, 1783 — 264,400,000 seconds. A total of 25,000 Americans are estimated to have died as a result of the war.
It's about 0.000000001 times as long as FDR's Presidential Term
In other words, 0.40 seconds is 0.0000000010470 times the length of FDR's Presidential Term, and the length of FDR's Presidential Term is 955,100,000 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 382,100,000 seconds 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 0.0000000010 times as long as King Tut's reign
In other words, 0.40 seconds is 0.000000001000 times the length of King Tut's reign, and the length of King Tut's reign is 1,000,000,000 times that amount.(a.k.a. Tutankhamun, a.k.a. Tutankhaten, a.k.a. tVwa:t-ʕa:nəx-ʔaˡma:n) (1333 BCE - 1324 BCE)
Pharaoh of the 18th dynasty, Tutankhamun begin his reign at the age of eight in 1333 BCE and remained pharaoh until 1324 BCE — 300,000,000 seconds later. When artifacts from Tut's tomb were on display at the Metropolitan Museum of Art (New York City, New York) from late 1976 to 1979, they were viewed by an estimated 8 million people.