Administrative Regulations on the Controlled Telecommunications Radio-Frequency Devices Article 22

The import permit shall be valid for one year and limited to import CTRFDs once. If necessary, the permit can be extended once for one year before expiration. Only one extension shall be allowed. However, the validity of import permit cannot be longer than the validity of setup permit or special program authorization document.In the case of a lost import permit, the holder shall apply for reissue herewith to NCC.
中文原文 電信管制射頻器材管理辦法第22條
進口許可證有效期間為一年,每證限使用一次。
必要時,得於期間屆滿前申請展期一年,並以一次為限。
但進口許可證有效期間不得超過架設許可證或專案核准文件之有效期間。
進口許可證遺失時,應檢附申請書向主管機關申請補發。

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