If you can't get a residence permit, how long will the police station send a notice?

24 hours. Usually, after receiving the application for residence permit, the Public Security Bureau will notify the applicant by SMS within 24 hours if it does not meet the requirements and fails to pass the examination. The content generally means that the residence permit you applied for was not approved because it did not meet the requirements of XXX. You can apply again after meeting the application conditions. Residence permit is an attempt made by some developed cities in China to learn from the "green card" system of developed countries, which has accumulated experience for China to formulate skilled migration measures and eventually form China's national "green card" system. Holders of residence permits can enjoy the treatment of local residents.