Land Act Article 214

The period in which any land is reserved for expropriation according to the provisions of the preceding Article shall not exceed three years. Failure to carry out expropriation within the said time limit shall result in the cancellation of the reservation. But in the case of any undertaking mentioned in Section (1) or (4) of the preceding Article, the period in which any land is reserved for expropriation may be extended with the approval of the competent authorities upon the request of the agency responsible for the said undertakings, provided that the period thus extended be no longer than five years.
中文原文 土地法第214條
前條保留徵收之期間,不得超過三年,逾期不徵收,視為廢止。
但因舉辦前條第一款或第四款之事業,得申請核定延長保留徵收期間;其延長期間,以五年為限。

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