Police Duty Act Article 15

Duty hours is 24 hours a day. Starting at 00:00 and ending at 24:00. The period from 00:00 to 6:00 is the midnight shift; from 18:00 to 24:00 is the night shift, and the rest of time is the day shift. Each police department sets the rotating pattern for its police duty hours.Duty hours for a police officer in a day is basically eight hours. If necessary, it can be extended subject to the actual situation. Duty officers are scheduled two days off a week, but they might be canceled in case of emergencies. Police officers may be required to stand by at police organizations to respond to security situations.The aforementioned shift-length extension, day-off suspension, or standing by to perform duties shall be made up afterwards.
中文原文 警察勤務條例第15條
每日勤務時間為二十四小時,其起迄時間自零時起至二十四時止。
零時至六時為深夜勤,十八時至二十四時為夜勤,餘為日勤。
勤務交接時間,由警察局定之。
服勤人員每日勤務以八小時為原則;必要時,得視實際情形酌量延長之。
服勤人員每週輪休全日二次,遇有臨時事故得停止之;並得視治安狀況需要,在勤務機構待命服勤。
前項延長服勤、停止輪休或待命服勤之時間,酌予補假。

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