duration duration /ˈdʊˈreɪʃən/

noun

1. () The period of time during which something continues  ( continuance , duration )
   the period of time during which something continues
     The duration of the concert was three hours.
   The duration of the concert was three hours.
   
2. () Continuance in time  ( duration , length )
   continuance in time
    The ceremony was of short duration
   the ceremony was of short duration
    He complained about the length of time required
   he complained about the length of time required
   
3. () The property of enduring or continuing in time  ( continuance , duration )
   the property of enduring or continuing in time