noun (n)

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

  Synonym:
  continuation, lengthiness, prolongation
  

  source: wordnet30
• the act of prolonging something(noun.act)

  Synonym:
  lengthening, perpetuation, prolongation
  

  source: wordnet30
• A drawing out, or continuing; the act of delaying the termination of a thing; prolongation; continuance; delay; as, the protraction of a debate.(noun)

  source: webster1913