There is no term of validity. It is always valid. Because a will will become effective when the successor dies, and no specific time for its expiration is specified, it can be deemed invalid only when the will is found to be illegal, but the effective period of litigation involving a will dispute is generally three years, and the limitation period of litigation is calculated from the date when the obligee knows or should know that the rights are damaged and the obligor. If, after the beginning of succession, the successor abandons succession, he shall make a disclaimer of succession before the disposition of the estate. If there is no indication, it shall be deemed as acceptance of inheritance. The legatee shall, within two months after learning of the legacy, make an indication of accepting or abandoning it. If there is no indication at the expiration of the time limit, it shall be deemed as a waiver of legacy.
 Legal basis
 Article 188 of the Civil Code of the People's Republic of China [Ordinary limitation of action, maximum period of protection of rights] The limitation of action to apply to the people's court for protection of civil rights is three years. If the law provides otherwise, such provisions shall prevail.
 The limitation period of action shall be counted from the date when the obligee knows or should know that his rights have been damaged and the obligor. If the law provides otherwise, such provisions shall prevail. However, if it has been more than 20 years since the date of damage to rights, the people's court shall not protect them. Under special circumstances, the people's court may decide to extend them on the application of the obligee.