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The measured duration of an event.
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|Noun||1.||elapsed time - the time that elapses while some event is occurring|
period, period of time, time period - an amount of time; "a time period of 30 years"; "hastened the period of time of his recovery"; "Picasso's blue period"
one-way light time, OWLT - the elapsed time it takes for light (or radio signals) to travel between the Earth and a celestial object