Regulations Governing the Offering and Issuance of Securities by Securities Issuers Article 54

With exception for the lock-up period in accordance with the law, an employee may request for exercising the stock warrants pursuant to the terms and conditions set by the company after 2 full years since the issuance of the employee stock warrants.The term of the employee stock warrants may not be more than 10 years.
中文原文 發行人募集與發行有價證券處理準則第54條
員工認股權憑證自發行日起屆滿二年後,持有人除依法暫停過戶期間外,得依發行人所定之認股辦法請求履約。
員工認股權憑證之存續期間不得超過十年。

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