Enforcement Rules of the Customs Act Article 10

Customs designates the time and place for unloading of imported goods and issues a general discharge permit under Article 24 of the Act. The time of unloading shall be confined within the office hours of Customs. In case of the imported goods to be unloaded out of the office hours, a special permit may be issued upon request.
中文原文 關稅法施行細則第10條
海關依本法第二十四條規定,指定進口貨物起卸之時間及地點,並核發普通卸貨准單,其指定之起卸時間,應在海關辦公時間以內。
如必須於辦公時間以外起卸者,得依申請核發特別准單,憑以起卸。

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