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How long is 2.5 hours?

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It's about two-thirds as long as Gone with the Wind (film).
In other words, 2.5 hours is 0.662 times the length of Gone with the Wind (film), and the length of Gone with the Wind (film) is 1.51 times that amount.
(1939)
Gone with the Wind, the multiple Academy Award-winning film, had a running time of 3.77 hours for its 1939 copyright release. The scene depicting the burning of the Atlanta Depot cost $25,000 (unadjusted) and was filmed on a 0.16 sq. km (40-acre) set using all seven Technicolor cameras in existence at the time.
It's about one-and-seven-tenths times as long as a Football game (Association) (Soccer).
In other words, the length of a Football game (Association) (Soccer) is 0.59 times 2.5 hours.
(a.k.a. association football, a.k.a. soccer) (per FIFA rules; playing time only)
Per Fédération Internationale de Football Association (FIFA) Laws of the Game, an association football game consists of two periods of 0.75 hours each, for a total of 1.5 hours of playing time (except in games played by women, or by players under 16 or over 35 years of age). The longest recorded amateur football game was a 2009 match in the Filipino town of Barotac Nuevo that lasted for 35 hours.
It's about two-and-a-half times as long as The Football game (American).
In other words, the length of The Football game (American) is 0.4 times 2.5 hours.
(a.k.a. American football) (per NFL rules; playing time only)
Per National Football League Rules, an American football game consists of four periods of 0.25 hours each for a total of 1 hour. The total duration of a football game can often be more than three hours, including stoppages of play, the intermission at halftime, team timeouts, and, in televised games, commercial timeouts. The Super Bowl — the highest-profile game of the sport — aired 0.75 hours of commercials in 2009.
It's about two-fifths as long as The First Indianapolis 500.
In other words, 2.5 hours is 0.37301 times the length of The First Indianapolis 500, and the length of The First Indianapolis 500 is 2.6809 times that amount.
(a.k.a. Indy 500, a.k.a. International 500-Mile Sweepstakes Race) (1911) (Indianapolis, Indiana)
The first recorded automobile race of its distance, the inaugural Indianapolis 500 was won by Ray Harroun in 6.7022 hours. Haroun's average speed through the race was 120 kph (74.59 mph).
It's about three times as long as a Basketball game.
In other words, 2.5 hours is 3.13 times the length of a Basketball game, and the length of a Basketball game is 0.319 times that amount.
(NBA regulation; playing time only)
Per National Basketball Association rules , a basketball game (without an overtime) consists of four periods of 0.2 hours each, for a total of 0.8 hours of playing time. The first basketball game, played in a Springfield Massachusetts YMCA, was played in 0.5 hours and ended with a score of 1-0.
It's about three-tenths as long as The Longest Pro Baseball Game.
In other words, 2.5 hours is 0.297 times the length of The Longest Pro Baseball Game, and the length of The Longest Pro Baseball Game is 3.37 times that amount.
(1981) (McCoy Stadium, Pawtucket, Rhode Island)
The longest professional baseball game in history — a triple-A game between the Pawtucket Red Sox and the Rochester Red Wings — took place between April 18th and 19th, 1981 lasting a total of 8.4 hours (and 33 innings). The Red Sox ultimately won the game 3-2, but not before the game set twelve records, including the most plate appearances by a single player - a three-way tie between Tom Eaton, Dallas Williams, and future Hall-of-Famer Cal Ripken Jr., all of Rochester.
It's about one-fifth as long as The First light bulb test (Edison, 1879).
In other words, 2.5 hours is 0.172 times the length of The First light bulb test (Edison, 1879), and the length of The First light bulb test (Edison, 1879) is 5.81 times that amount.
(Thomas Edison's filament Thread No. 9) (1879) (total time)
Lit at 1:30am on October 22nd, 1879, the first Edison completed his first majorly successful test of his light bulb, which continued to burn for 14.5 hours until the bulb glass succumbed to the heat and cracked, extinguishing the filament. Within 26,300 hours of his success, Edison was selling 45,000 light bulbs per day to large companies across the country.