code: def get_duration(self):
          
          mins, secs = divmod(self.duration_sec, 60)
          hours, mins = divmod(mins, 60)
          return "%02dh %02dm %02ds" % (hours, mins, secs)
docs: Get duration formatted
          Format is : "HHh MMm SSs"
          Example : "10h 20m 40s"
  
          :return: Formatted duration
          :rtype: str