Regulations Governing the Customs Management of Import and Export Warehouses Article 13

The unloading period of import goods for storage into the warehouse and the period for the withdrawal of Customs-released export goods out of the warehouse are limited to the period from 6:00 a.m. to 6:00 p.m. daily, except on holidays. The storage of export goods into the warehouse and withdrawal of Customs-released import goods from the warehouse shall be limited to the Customs office hours. However, the foregoing time limits are not applicable to a warehouse placed under the autonomous management system by the Customs, or to the procedure of examination and release alongside the aircraft, in express cargo handling zones, or other specific circumstances approved by the Customs.
中文原文 海關管理進出口貨棧辦法第13條
進口貨物卸存貨棧,及已經放行之出口貨物提出貨棧,限於例假以外每日上午六時至下午六時之時間內為之。
出口貨物存入貨棧,及已放行進口貨物提出貨棧,應在海關辦公時間內為之。
但經海關核准實施自主管理之進出口貨棧、機邊驗放、快遞貨物專區之貨物或其他特殊情形經海關核准者除外。

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