It takes two to three years to graduate from the on-the-job doctoral program, and students need to obtain a master's degree certificate and work experience for six years before they are eligible to enroll in the on-the-job doctoral program. You need to finish your study tasks at school and take time out to study, so as to ensure that you can graduate smoothly. On-the-job doctoral students generally need to study for two to three years after graduation, mainly enrolling students in the same way.