I was just in an 8-hour class where I used S-Note extensively. (From 8:30a to 4:30p.) I took around 20 pages of notes. When I wasn't actively taking notes, I was experimenting with the features of S-Note and the tablet in general since it's pretty new to me, as well as browsing the web, Facebook, etc. When the class started my battery was at 83% (I didn't plug it in until very late last night and didn't turn it off while it charged, so it wasn't fully charged when I left home this morning). As of now, over 45 minutes after the class, my battery is at 53%. My screen brightness has been around 25% all day which was plenty bright in a brightly lit room.
We did have a half-hour lunch, and a couple breaks during which the screen was off. But, not too shabby, if you ask me.
Samsung Galaxy Note 10.1 2014 Edition - Stock
Samsung Galaxy S3 - Hyperdrive RLS16
Asus Transformer Infinity TF700 - CROMi-X (Replaced because it's a piece of crap!)
Asus Transformer TF101 (Wife's) - TeamEOS4
Samsung Captivate - Slim ICS (Now an MP3 player and game device for my daughter)
Samsung Galaxy Tab 10.1 - Task650's Galaxy Task 13