Two years. The adult self-study exam of Beijing Institute of Technology generally lasts for two years, and there is no time limit for graduation. You can only apply for graduation if you pass all the examination subjects, and you can get a diploma in about 1.5 -2 years at the earliest. Adults need to have a college degree recognized by the state. Generally, the examination course is 13- 15, and you can get a diploma after all of them pass. Beijing Institute of Technology, hereinafter referred to as "Beijing Institute of Technology" and "University of Science and Technology Beijing", is the first science and engineering university founded by China * * * Production Party, formerly known as Yan 'an Academy of Natural Sciences.