I applied for a student visa on May 9, 2018. Once I finished all remaining requirements like medical checks, I decided to go home to my country whilst waiting for the visa. So I purchased a ticket for May 28 returning end of June. Now, I knew that I was supposed to apply for a BVB before leaving, however, I was so stupid on not researching first how long I have to do it before I really need to leave. Long story short, I applied for the BVB two days before I left and got declined.