Yes, it is mandatory that you choose to live in the hostel during the course period at National Law University (NLU), Delhi. Most essentially, NLU Delhi offers a personal residential campus wherein students are expected to stay while pursuing their courses. 

However, there are times that you can otherwise choose not to stay full-time in the hostel of NLU Delhi. It is only in certain distinct circumstances that students are permitted to be day-scholar. You will need permission from the administration for the same.