code: func (eg *EngineGroup) SetConnMaxLifetime(d time.Duration) {
  	eg.Engine.SetConnMaxLifetime(d)
  	for i := 0; i < len(eg.slaves); i++ {
  		eg.slaves[i].SetConnMaxLifetime(d)
  	}
  }
docs: // SetConnMaxLifetime sets the maximum amount of time a connection may be reused.