I didnt study very much in nursing school. 4-5 hours the day before the test (interspersed with various TV and food breaks of course). I also didnt read my textbooks at all.
What will really get you is the paperwork and prep for clinicals. We did alot of pre-clinical prep in my program and the care plans
were a nightmare....we're talking 15+ solid hours working on a care plan. Our instructors required VERY detailed care plans and alot of them wouldnt allow us to use care plan books at all so we would have to go looking for journal articles and stuff and that takes FOREVER. That may not sound too bad but it will get you when you have 3 different classes/clinicals going at once.
Of course, we can all tell you what our experience was but this all depends on how much study time you need, your program, and your instructors. The instructor and how picky they are really makes all the difference.
I was able to work a little...like 4 days a month which I scheduled according to when assignments were due and when I had tests. I also planned an out of town wedding and got married during nursing school.