Enforcement Act of the Part of Rights In Rem of the Civil Code Article 13

If a covenant with a period for non-partition of a thing held in indivision has been made before the coming into force of the BOOK of RIGHTS in REM of the CIVIL CODE, and if the remainder of the period, reckoning from the date of its coming into force, is shorter than that provided in the second paragraph of Article 823, such period shall be followed; if the remainder is longer, the provisions of the second paragraph of Article 823 shall be applied as from the date of the coming into force of the BOOK of RIGHTS in REM of the CIVIL CODE.The provisions of the revised Article 823Ⅲof the CIVIL CODE shall apply to the covenant with a period for non-partition before the coming into force of the revision of the BOOK of RIGHTS in REM of the CIVIL CODE.
中文原文 民法物權編施行法第13條
民法物權編施行前,以契約訂有共有物不分割之期限者,如其殘餘期限,自施行日起算,較民法第八百二十三條第二項所定之期限為短者,依其期限,較長者,應自施行之日起,適用民法第八百二十三條第二項規定。
修正之民法第八百二十三條第三項規定,於民法物權編修正施行前契約訂有不分割期限者,亦適用之。

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