elapsed time
noun
the total amount of time from the start of an event to its finish, without subtracting any timeouts or breaks (used especially in racing).
The grammatical form denoting more than one person, place, thing, or idea.
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Even though clocks measure different elapsed times for the same process, they still agree that relative speed, which is distance divided by elapsed time, is the same.
From Textbooks ● Aug. 12, 2015