Administrative Appeal Act Article 85

Since the next day which the receipt of the administrative appeal pleading, the administrative appeal decision shall be made within 3 months which may be extended if necessary, provided that the administrative appellant and intervenor appellant were notified. The period can only be extended one time with two months limits.The period stipulated in last Paragraph shall calculate from the next day when the administrative appeal pleading presented to the agency with jurisdiction of administrative appeal while according to Article 57, except the administrative appellant failed to present the administrative appeal pleading, the period shall calculate from the next day of the expiration date of period for presentation of an administrative appeal pleading. While the agency with jurisdiction of administrative appeal made a notification to supplement according to Article 62, the period shall calculate from the next day when the pleading has been supplemented, while failed to so, the period shall calculate from the next of the expiration date of period for submission of an administrative appeal pleading.
中文原文 訴願法第85條
訴願之決定,自收受訴願書之次日起,應於三個月內為之;必要時,得予延長,並通知訴願人及參加人。
延長以一次為限,最長不得逾二個月。
前項期間,於依第五十七條但書規定補送訴願書者,自補送之次日起算,未為補送者,自補送期間屆滿之次日起算;其依第六十二條規定通知補正者,自補正之次日起算;未為補正者,自補正期間屆滿之次日起算。

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