docs: def heating_remaining(self):
          """Return seconds of heat time remaining."""
          try:
              if self.side == 'left':
                  timerem = self.device.device_data['leftHeatingDuration']
              elif self.side == 'right':
                  timerem = self.device.device_data['rightHeatingDuration']
              return timerem
          except TypeError:
              return None