Battery Life

I did a search of past threads but couldn't find exactly the answer I was looking for. I am a student, about to start a semester of university with my new macbook. I was planning on using it to take notes, one of the days I am on campus 12-8, with a one hour break. However, 4 of those hours is maths, which I probably won't be using my macbook to take notes for.

My question is, if I turn off wireless and bluetooth, how long will I get out of my battery, just typing into iWork?
Thankyou

With wireless and bluetooth switched off, you can get upto 7 1/2hrs on the new Macbooks. Even on my late 2007 I get 3-4 hours surfing the net, with a few light apps running in the background.