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Like how a dozen is twelve, and a baker's dozen is thirteen, a jaco is a length of time lasting for two minutes. Can be multiplied or divided to apply to most lengths of time, eg 10 minutes is 5 jacos, and 30 seconds is a quarter of a jaco. Conversationally, the word Jaco can be used instead of other words such as 'jiffy' when telling someone that you won't be long.
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