How long can I get the application number after patent application?

About a week. In the process of patent application, we need to go through a series of reviews and procedures, including the review of application documents, novelty retrieval and so on. All these tasks will take some time to complete. In addition, patent applications also need to pay related fees in accordance with regulations. After the fee is paid, the patent office will formally accept it and give the application number. Therefore, on the premise that the documents are submitted completely, you can usually receive the admission notice in about a week, which contains the application number.