i dont see the obsession in counting the number of hours one studies
personally, i rather spend 20 minutes on a topic/subject/wateva and make sure i know it all, over studying mindlessly for X amount of hours
Person A: i studied 18 hours today
Person B: great, i did about 1, was pretty happy, i know one module of Physics now
Person A: really? wow i wish i knew a module
yeh..fantastic