code: def set_elapsed_time(self, client):
          
          related_clients = self.get_related_clients(client)
          for cl in related_clients:
              if cl.timer is not None:
                  client.create_time_label()
                  client.t0 = cl.t0
                  client.timer.timeout.connect(client.show_time)
                  client.timer.start(1000)
                  break
docs: Set elapsed time for slave clients.