#duration__continuance  the period of time during which something continues
  supertype:  #time_period__period__period_of_time  an amount of time; "a time period of 30 years"; "hastened the period of his recovery"
  subtype:  #clocking  the time taken to traverse a measured course; "it was a world record clocking"
  subtype:  #longueur  a period of dullness or boredom (especially in a work of literature or performing art)
  subtype:  #residence_time__residencetime  the period of time spent in a particular place
  subtype:  #span  the complete duration of something; "the job was finished in the span of an hour"
     subtype:  #attention_span__attentionspan  the length of time you can concentrate on some idea or activity
  subtype:  #stretch.duration__stint  an unbroken period of time during which you do something; "there were stretches of boredom"; "he did a stretch in the federal penitentiary"
  subtype:  #time_scale  an arrangement of events used as a measure of duration; "on the geological time scale mankind has existed but for a brief moment"
     subtype:  #extended_time_scale__slow_time_scale  (in simulation) the time scale used in data processing when the time-scale factor is greater than one
     subtype:  #fast_time_scale  (in simulation) the time scale used in data processing when the time-scale factor is less than one
  subtype:  #time_value__value__note_value  (music) the relative duration of a musical note
  subtype:  #rule.duration  the duration of a monarch's or government's power; "during the rule of Elizabeth"
     instance:  #Regency

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