duration of existence

See: age
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The lifetime of the tetraneutron [tau] is determined from the reason of the duration of existence of four neutrons in a bound state, which should at least be sufficient for one circulation of medium flow along the contour having some diameter d.
We had hits from day one, and as of this writing have had thousands upon thousands of lookers in its short duration of existence.
creation), Descartes is considering both continuation of motion, and duration of existence as the continuous result of an action.