Juvenile Justice Act Article 57

A disposition made in accordance with Article 29, Paragraph 1, a disposition made in accordance with Article 42, Paragraph 1, Subparagraph 1, and a disposition of detention for observation made in accordance with Article 55, Paragraph 3 or Article 55-3 shall be executed within 2 years from its pronouncement; the execution shall be exempted if such period lapses.Where a disposition made in accordance with Article 42, Paragraph 1, Subparagraphs 2, 3, 4 and Paragraph 2 is not executed within 3 years from the day it shall be executed, such a disposition may not be executed unless a juvenile court delivers a ruling of execution.
中文原文 少年事件處理法第57條
第二十九條第一項之處分、第四十二條第一項第一款之處分及第五十五條第三項或第五十五條之三之留置觀察,應自處分裁定之日起,二年內執行之;逾期免予執行。
第四十二條第一項第二款、第三款、第四款及同條第二項之處分,自應執行之日起,經過三年未執行者,非經少年法院裁定應執行時,不得執行之。

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