Implementation Regulations Governing the Operation of Customs-Port-Trade (CPT) Single Window Article 9

The service provided by the CPT Single Window shall be available twenty four hours a day all year-round.In case of a temporary suspension of the service following an initiation of the emergency measure, the operator of the through-Customs value-added network shall comply with the enforcement of such measures.The method and procedures of the aforementioned back up measure shall be stipulated by the Customs Administration of the Ministry of Finance.
中文原文 關港貿單一窗口運作實施辦法第9條
關港貿單一窗口提供全年每日二十四小時連線服務。
關港貿單一窗口連線服務遇有障礙,採取備援措施辦理時,通關網路業者應配合施行備援措施作業。
前項備援措施之作業方式及程序,由財政部關務署定之。

English translation for reference only; the Chinese text prevails. Not legal advice.