noun (n)

• the period of time during which something continues(noun.time)

  Synonym:
  continuance
  

  source: wordnet30
• the property of enduring or continuing in time(noun.time)

  source: wordnet30
• continuance in time(noun.attribute)

  Example:
  The ceremony was of short duration.
  

  Synonym:
  length
  

  source: wordnet30
• The state or quality of lasting; continuance in time; the portion of time during which anything exists.(noun)

  source: webster1913