six months. According to the query, China Law Network shows. Article 44 of the Contract Law of the People's Republic of China stipulates that the parties may agree on the quality guarantee period. There is no agreement. According to Article 142 of the General Principles of the People's Republic of China and the Civil Law of the People's Republic of China, the quality guarantee period is six months after the performance of the contract, so the three-package warranty period of the door billboard is six months. The new "Three Guarantees" regulation came into effect on August 25th, 1995. Consumers have the right to ask sellers, repairers and producers to bear the responsibility of "Three Guarantees" if they buy products listed in the "Three Guarantees" catalogue after that date.