Source : Webster's Revised Unabridged Dictionary (1913)

Hours \Hours\, n. pl. [A translation of L. Horae (Gr. ?). See
   {Hour}.] (Myth.)
   Goddess of the seasons, or of the hours of the day.

         Lo! where the rosy-blosomed Hours, Fair Venus' train,
         appear.                                  --Gray.

Source : WordNet®

hours
     n 1: a period of time assigned for work; "they work long hours"
     2: an indefinite period of time; "they talked for hours"