It's about one-and-nine-tenths times as long as The First movie.
In other words, 3.9 seconds is 1.85 times the length of The First movie, and the length of The First movie is 0.541 times that amount.(1888) (Roundhay Garden Scene, National Museum of Photography, Film, and Television restored copy)
Filmed in 1888 by Louis Aimé Augustin Le Prince, Roundhay Garden Scene is the oldest surviving motion picture with a total running time of 2.11 seconds.
It's about half as long as a Pit Stop.
It's about one-third as long as The First airplane flight (Wright Flyer, 1903).
In other words, the length of The First airplane flight (Wright Flyer, 1903) is 3 times 3.9 seconds.(Wright Flyer) (1903)
The first successful airplane flight was made by Orville Wright on December 17th, 1903 and lasted 12 seconds, covering a horizontal distance of 37 m (121.39 ft). The stopwatch used by Orville and his brother Wilbur to time this flight is on display at the Smithsonian National Air and Space Museum in Washington, D.C.
It's about one-fifteenth as long as The San Francisco earthquake of 1906.
In other words, the length of The San Francisco earthquake of 1906 is 13.5 times 3.9 seconds.(1906) (Mussel Rock Fault, California) (sensible duration)
The San Francisco earthquake of 1906 caused perceptible shaking of the ground for about 45 to 60 seconds. The most devastating natural disaster in California's history, the quake was felt as far away and southern Oregon and western Nevada, and resulted in about 3,000 deaths, the displacement of 55% - 70% of the city's population, and the shifting of some spots of ground by up to 6 m (20 ft).
It's about one-two-hundredth as long as The First spacewalk.
In other words, 3.9 seconds is 0.0054 times the length of The First spacewalk, and the length of The First spacewalk is 190 times that amount.(1965) (Alexi Lenovo, a.k.a. Алексе́й Архи́пович Лео́нов)
On March 18th, 1965, during the Voskhod 2 Soviet space mission, cosmonaut Alexey Arkhipovich Leonov conducted the first human spacewalk, which lasted 720 seconds. The total mission length was 1 day, 2 hours, 2 minutes, and 17 seconds.
It's about one-two-hundred-fiftieth as long as Louis-Antoine's reign.
In other words, the length of Louis-Antoine's reign is 300 times 3.9 seconds.(a.k.a. Louis-Antoine d'Artois, petit-fils de France, fils de France, duc d'Angoulême, a.k.a. Count of Marnes) (1830)
Following his father, Charles X's, abdication on the eve of the 1830 French Revolution, Louis-Antoine d'Artois was technically king for a period of approximately 1,000 seconds on August 2nd, 1830. Louis-Antoine's only official act as king was to abdicate the throne to his nephew, the Henri, the Duke of Bordeaux.
It's about one-seven-hundred-fiftieth as long as a Basketball game.
In other words, 3.9 seconds is 0.00135 times the length of a Basketball game, and the length of a Basketball game is 741 times that amount.(NBA regulation; playing time only)
Per National Basketball Association rules , a basketball game (without an overtime) consists of four periods of 720 seconds each, for a total of 2,880 seconds of playing time. The first basketball game, played in a Springfield Massachusetts YMCA, was played in 1,800 seconds and ended with a score of 1-0.