I remember in primary and middle school I used to study for at least two hours per day, and if I have exams or quiz coming up, I will study for around 6 hours a day. I was such an achiever back then lol. And then it's all ruining down when I was in highschool. I literally was fed up with all the studying I have done so I stop studying altogether and I was almost getting kicked out of school.
Now in university I try to study AT LEAST 4 hours per week. Once you become a lazy ass student, it's hard to get back up to your old, diligent self. Thank God I still get decent grades lol