Do what works for you, but don't overdo it. Don't study 8 hours straight just because you set an arbitrary number. In my fire academy I've caught myself trying to finish a chapter but found myself nodding off in between reading the same page 3 or 4 times....sire I could spend another hour trying to force myself to finish "reading" the chapter(s) I wanted to read that night before going to bed, or I could recognize that in that state my brain is retaining the info just as effectively as if I was goofing off online instead, so it's better to go to bed then and wake up a bit earlier before class and do some reading/studying in the morning.
So yeah, have the drive and discipline to set out blocks of study time, but don't forget to listen to your body and don't over do it because of an arbitrarily set number.
Figure out what works for you, what works for me may not work for you and vice versa. It's ok to take a few weeks of actually having to go to class and study to figure it out, and if that turns out different than what you have planned now before the actual stress of school, that's ok too.