Administrative Regulations Governing the Establishment and Use of Dedicated Telecommunications Network for Research and Development Purposes Article 25

In addition to a short-term test that applies to the competent authority pursuant to the regulations or technical inspection that the competent authority conducts, radio stations shall not transmit radio waves during the period of station establishment. The period of short-term tests shall not exceed five (5) days.
中文原文 實驗研發專用電信網路設置使用管理辦法第25條
電臺設置期間,除依規定向主管機關申請之短期測試或主管機關進行現場技術審驗外,該電臺不得發射電波。
短期測試之期間最長不得逾五日。

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