code: def duration(seconds):
      
      if seconds < 1:
          return 'less than 1 sec'
      seconds = int(round(seconds))
      components = []
      for magnitude, label in ((3600, 'hr'), (60, 'min'), (1, 'sec')):
          if seconds >= magnitude:
              components.append('{} {}'.format(seconds // magnitude, label))
              seconds %= magnitude
      return ' '.join(components)
docs: Return a string of the form "1 hr 2 min 3 sec" representing the
      given number of seconds.