Legal analysis: 3 years from the date of the expiration of the repayment period is the statute of limitations stipulated by law. During this period, you must claim your creditor's rights from the borrower. After 3 years, the court will not protect your creditor's rights. If no repayment date is specified, the longest limitation of action is 20 years.

Legal basis: Article 188 of the Civil Law of People's Republic of China (PRC) requests the people's court to protect civil rights, and the limitation of action is three years. Where there are other provisions in the law, those provisions shall prevail. The limitation period of action shall be counted from the date when the creditor knows or should know that the right is damaged and the debtor knows it. Where there are other provisions in the law, those provisions shall prevail. However, if more than 20 years have passed since the right was damaged, the people's court will not protect it; Under special circumstances, the people's court may decide to extend the time limit upon the application of the obligee.