code: def start(self):
          
          self._end_time = datetime.now() + timedelta(seconds=self._max_time)
          self._thread = Thread(target=lambda: self.__stand_by_loop())
          self._keep_running = True
          self._thread.start()
          return self
docs: Start standing by.  A periodic command like 'current_url' will be sent to the 
          webdriver instance to prevent it from timing out.