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A kilosecond (symbol: ks) is 1000 seconds (16 minutes, 40 seconds), so there are 86.4 kiloseconds in a 24 hour day, and 604.8 kiloseconds in a week. The second is the International System of Units (SI) base unit of time, which, combined with the prefix kilo- (which means 1000) results in a kilosecond. Although the metric system dictates the use of the kilosecond, it is rarely used in practice. The more common (and irregular) units of minutes (60 seconds) and hours (60 minutes) result in a conversion factor of 3600 when converting seconds to hours. The term kilosecond is most commonly found in astrophysics research articles.

A kilosecond is the longest observation of anti-atom confinement as of 14 April 2011.[1]

Many cultural, educational, and sporting events exist in the range of 1 to 10 ks. Those include most lectures, feature films, stage plays, operas, stand-alone ballets, and in classical music most works in sonata form (the longest such work in the classical repertory is the Third Symphony of Gustav Mahler at roughly 93 minutes (5.58 ks), which is roughly as long as one of the most widely-performed ballets, The Nutcracker. Some compositions in sonata form can be shorter than 1 ks in duration. The baroque concerto grosso, typically not in a sonata form, usually takes less than 1 ks to play.

An hour is 3.6 kiloseconds, the nominal time of professional basketball, hockey, and football (soccer or American football) games; although the event typically takes more time due to intermissions, time-outs, and other stoppages of the clock. The shortest full nine-inning Major League baseball game ever played took only 51 minutes (3.06 ks) to play,[citation needed] although the longest major-league baseball game (which took 25 innings to complete over two days) took 8 hours and 6 minutes (29.16 ks),[2] which is longer than the standard 8-hour work day (28.8 ks) in the United States and some other countries. A significant minor-league game that lasted 33 innings and 11 hours and 25 minutes (41.11 ks) of playing time between the Pawtucket Red Sox and the Rochester Red Wings played on April 18 and 19, 1981[3] at the least allowed baseball fans to see 25 combined at-bats by eventual Baseball Hall of Fame players Wade Boggs and Cal Ripken, Jr.

The standard day is 86.4 ks, while a week is 604.8 ks. The standard work week (40 hours) is 144 ks. Most international non-stop flights occur in the 10-100 kilosecond range. Singapore Airlines operated the longest scheduled non-stop flights on record: Newark to Singapore at 18 hr 50 min (67.8 ks), a flight discontinued in 2004; and Los Angeles to Singapore at 18 hr 5 min (65.1 ks), discontinued in 2013. Longer flights of between nearly-antipodal locations are theoretically possible but impractical with sub-sonic flights.

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