How soon can I receive the SMS verification code for the reserved subject?

How soon can I receive the SMS verification code for the reserved subject? Appointment subject 2 generally receives SMS verification code two or three days before the appointment test date. The following is the introduction of the two parts of the appointment subject: 1, and the law stipulates that according to Article 40 of the Regulations on the Application and Use of Motor Vehicle Driving License issued by OrderNo. 139 of the Ministry of Public Security, those who apply for a motor vehicle driving license for the first time or apply for adding the types of vehicles that are allowed to drive, apply for small cars, small automatic cars, low-speed trucks, three-wheeled cars, small automatic passenger cars for the disabled, wheeled self-propelled vehicles and trolleybuses. Note: After the appointment is successful, please bring your valid ID to take the exam at the appointed time and examination room. If you don't take the exam on time, the result of this exam will be judged as failing. @20 19