#longness  duration as an extension
  exclusion:  #shortness.duration
  supertype:  #duration.temporal_property__length  continuance in time; "the ceremony was of short duration"; "he complained about the length of time required"
  subtype:  #length_of_service__longevity  duration of service: "her longevity as a star"; "had unusual longevity in the company"

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