duration

duration
    n 1: the period of time during which something continues [syn:
         {duration}, {continuance}]
    2: the property of enduring or continuing in time [syn:
       {duration}, {continuance}]
    3: continuance in time; "the ceremony was of short duration";
       "he complained about the length of time required" [syn:
       {duration}, {length}]
    

Duration \Du*ra"tion\, n. [OF. duration. See {Dure}.]
   The state or quality of lasting; continuance in time; the
   portion of time during which anything exists.
   [1913 Webster]

         It was proposed that the duration of Parliament should
         be limited.                              --Macaulay.
   [1913 Webster]

         Soon shall have passed our own human duration. --D.
                                                  Webster.
   [1913 Webster]
    

70 Moby Thesaurus words for "duration":
      abidingness, age, antiquity, changelessness, chronology, constancy,
      continuance, continuation, continuity, defeat of time,
      defiance of time, diuturnity, durability, durableness, duree,
      endurance, firmness, fixedness, frozenness, hardening, immobility,
      immovability, immovableness, immutability, invariability,
      invariableness, inveteracy, lastingness, long standing,
      long-lastingness, long-livedness, longevity, maintenance,
      perdurability, perennation, period, permanence, permanency,
      perpetualness, perpetuity, persistence, persistency,
      psychological time, quiescence, rigidity, run, solidity, space,
      space-time, span, spell, stability, standing, stasis,
      steadfastness, survival, survivance, tense, tenure, term,
      the future, the past, the present, tide, time, timebinding, torpor,
      unchangeability, unchangingness, while