I am a Ph.D. student in theoretical computer science. I meet my research supervisor once a week for around 2 hours. I prepare some of my research and try to present in front of him. I always try to make a list of theorems and claims given in the paper to discuss with him in a certain flow but most of the time he starts asking questions and then we go in other directions (which is okay from a research point of view). Due to this, it sometimes takes 2 months to read a single paper. I always try to follow my designed plan but it rarely works. Also, I don't feel satisfied most of the time because many times I am only able to discuss 50-60 percent of what I have planned. Please help.