code: def command_max_run_time(self, event=None):
          
          try:
              max_run_time = self.max_run_time_var.get()
          except ValueError:
              max_run_time = self.runtime_cfg.max_run_time
  
          self.runtime_cfg.max_run_time = max_run_time
          self.max_run_time_var.set(self.runtime_cfg.max_run_time)
docs: CPU burst max running time - self.runtime_cfg.max_run_time