Enforcement Rules for State Compensation Law Article 26

Where the negotiation does not conclude within 60 days from the date the negotiation begins, the liable compensating shall on the claimant request give him a certificate to prove the failure of the negotiation.If the claimant does not request the certificate as prescribed in the preceding paragraph, the claimant may request the liable compensating authority to resume the negation, but only for once.
中文原文 國家賠償法施行細則第26條
自開始協議之日起逾六十日協議不成立者,賠償義務機關應依請求權人之申請,發給協議不成立證明書。
請求權人未依前項規定申請發給協議不成立證明書者,得請求賠償義務機關繼續協議,但以一次為限。

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