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  2. Countdown - Wikipedia

    en.wikipedia.org/wiki/Countdown

    Seven seconds after launch of STS-121, the countdown clock at LC-39 at the Kennedy Space Center seen counting up, rather than down. In the context of a rocket launch, the "L minus Time" is the physical time before launch, e.g. "L minus 3 minutes and 40 seconds".

  3. Play clock - Wikipedia

    en.wikipedia.org/wiki/Play_clock

    A play clock, also called a delay-of-game timer, is a countdown clock intended to speed up the pace of the game in gridiron football.The offensive team must put the ball in play by either snapping the ball during a scrimmage down or kicking the ball during a free kick down before the time expires, or else they will be assessed a 5-yard delay of game (American football) or time count violation ...

  4. Unit of time - Wikipedia

    en.wikipedia.org/wiki/Unit_of_time

    About 17 minutes. hour: 60 min: deciday 0.1 d (10 % of a day) 2.4 hours, or 144 minutes. One-tenth of a day is 1 dd (deciday), also called "gēng" in traditional Chinese timekeeping. day: 24 h: Longest unit used on stopwatches and countdowns. The SI day is exactly 86 400 seconds. week: 7 d: Historically sometimes also called "sennight". decaday

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  6. Christmas tree (drag racing) - Wikipedia

    en.wikipedia.org/wiki/Christmas_tree_(drag_racing)

    A "Professional" tree will light up all of the large amber lights simultaneously, and then after a 4 ⁄ 10 second delay, light up the green light. [2] Some classes will use a hybrid tree, known as a .500 Professional tree, where the delay for the green light is .500 seconds instead of the .400 seconds used in a standard Professional tree.

  7. Metric time - Wikipedia

    en.wikipedia.org/wiki/Metric_time

    10 2: hectosecond: 100: 1.67 minutes (or 1 minute 40 seconds) 10 3: kilosecond: 1 000: 16.7 minutes (or 16 minutes and 40 seconds) 10 6: megasecond: 1 000 000: 11.6 days (or 11 days, 13 hours, 46 minutes and 40 seconds) 10 9: gigasecond: 1 000 000 000: 31.7 years (or 31 years, 252 days, 1 hour, 46 minutes, 40 seconds, assuming that there are 7 ...

  8. Shot clock - Wikipedia

    en.wikipedia.org/wiki/Shot_clock

    The NCAA introduced a 45-second shot clock for the 1985-86 season; [13] several conferences had experimented with it for the two seasons prior. [14] It was reduced to 35 seconds in the 1993–94 season, [15] and 30 seconds in the 2015–16 season. [16] The NAIA also reduced the shot clock to 30 seconds starting in 2015–16. [17]

  9. Second - Wikipedia

    en.wikipedia.org/wiki/Second

    10 seconds 10 −2 s cs centisecond 10 2 s hs hectosecond 1 minute, 40 seconds 10 −3 s ms millisecond: 10 3 s ks kilosecond 16 minutes, 40 seconds 10 −6 s μs microsecond: 10 6 s Ms megasecond 1 week, 4 days, 13 hours, 46 minutes, 40 seconds 10 −9 s ns nanosecond: 10 9 s Gs gigasecond 31.7 years 10 −12 s ps picosecond: 10 12 s Ts ...