code: def p_duration_number_duration_unit(self, p):
          'duration : NUMBER DURATION_UNIT'
          logger.debug('duration = number %s, duration unit %s', p[1], p[2])
          p[0] = Duration.from_quantity_unit(p[1], p[2]f p_duration_number_duration_unit(self, p):
          'duration : NUMBER DURATION_UNIT'
          logger.debug('duration = number %s, duration unit %s', p[1], p[2])
          p[0] = Duration.from_quantity_unit(p[1], p[2])
docs: duration : NUMBER DURATION_UNIT