How many hours should you/do you usually study per day? I've been getting away with cramming for exams in the last two or three days without going to lectures for years now, which has left me practically retarded and without any work ethic, and I'm not as smart as I think I am so I know this will fuck me up long-term. Google said 4-5 hours a day, which seems unrealistic to do every single day but idk.