Legal analysis: The mediation letter is valid for two years. The statute of limitations for applying for compulsory execution of a mediation letter shall not exceed two years. The court shall take compulsory execution within six months after the applicant files the application for compulsory execution. Otherwise, the applicant may apply to the higher court for execution. After review, the people's court at the next higher level may order the original people's court to carry out execution within a certain period of time or decide to have this court carry out the execution.
Legal basis: "Civil Procedure Law of the People's Republic of China"
Article 226: The People's Court has received more than six months since the date of receipt of the application for execution. If the execution has not been carried out within 3 months, the person applying for execution may apply to the people's court at the next higher level for execution. After review, the people's court at the next higher level may order the original people's court to implement within a certain period of time, or may decide to have this court implement the case or instruct another people's court to implement it.
Article 239 provides general provisions on the time limit for applying for enforcement, that is, "the period for applying for enforcement is two years. The suspension or interruption of the statute of limitations for applying for enforcement shall be subject to applicable laws regarding the suspension of statute of limitations." , interruption provisions.