D defs.my
Entry 1 sense Webster, 1913

Duration

/do͝or'-āsh'-ən/ · Du·ra·tion · IPA /dəˈɹeɪʃn̩/
01 n. The state or quality of lasting; continuance in time; the portion of time during which anything exists.
  1. 1.
    The state or quality of lasting; continuance in time; the portion of time during which anything exists.
    “It was proposed that the duration of Parliament should be limited.” Macaulay.
    “Soon shall have passed our own human duration.” — D. Webster.