Wow!
That's an impressive bit of kit in my opinion.
I laughed so hard at this.Dyslexic much?
If you are just using it to take notes and have the screen on a lower brightness, then I don't see why it wouldn't last a really long time. Not sure about 30 hours, but it should last considerably longer than normal. Taking notes uses little processing power, and does not use any internet radio, so most of the device would be in a lower power state.