Administrative Rules on the Establishment of Earth Stations by Satellite Broadcasters Article 8

The set-up permit shall be valid for one year. Those who are unable to complete the set-up within the period of validity should apply to the competent authority for an extension one month before the expiry, explaining the reasons and attaching the original set-up permit. The extension period shall not exceed six months, and the application of extension shall be granted only once.
中文原文 衛星廣播電視事業設置地球電臺管理辦法第8條
架設許可證之有效期間為一年,未能在有效期間內架設完成者,得於期滿前一個月敘明理由,附繳原架設許可證,向主管機關申請展期。
展期不得逾六個月,並以一次為限。

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