Regulations Governing Collection of Customs Service Fees Article 2

The term “office hours” stated in the Regulations refers to the official office hours of the customs offices, that is, from Mondays through Fridays, from 6:00 a.m. to 6:00 p.m. However, this does not include customs offices operating under double duty shifts, or open twenty-four hours for customs clearance processing, or open for customs clearance processing due to special circumstances as provided in the official Customs bulletin.
中文原文 海關徵收規費規則第2條
本規則所稱辦公時間,指海關辦公日,星期一至星期五為上午六時起至下午六時止。
但經海關公告實施兩班制或二十四小時通關及因特殊情形經海關公告派員辦理通關業務者,不在此限。

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