noun (n)

• the act of prolonging something(noun.act)

  Example:
  There was an indefinite prolongation of the peace talks.
  

  Synonym:
  lengthening, perpetuation, protraction
  

  source: wordnet30
• amount or degree or range to which something extends(noun.attribute)

  Synonym:
  extension, lengthiness
  

  source: wordnet30
• the consequence of being lengthened in duration(noun.attribute)

  Synonym:
  continuation, lengthiness, protraction
  

  source: wordnet30
• The act of lengthening in space or in time; extension; protraction.(noun)

  source: webster1913