It really depends on your use.
If I were to turn the screen on, radios off, etc. and just leave it I could probably break 10 hours. However, I could also unplug the phone, have it set to sync constantly and kill the battery without ever turning the screen on.
Average for a day is about 5-6 hours screen on time, using 4G and wifi. Web browsing, kindle, texting, gaming. I keep my syncs to a minimum though. Twitter set for manual, no FB, email for 1 hour. ( I think...) Brightness is 50%, power saving is CPU + Screen power + No Haptic ( so only background color unchecked. I have yet to find any game or anything that needs the extra power from the CPU, but its easy enough to disable that if I do. ) Motion activation off. Medium Dark wallpaper ( Same as my avatar ), No active widgets. Fair bit of junk disabled ( Weather, news, verizon stuff, stock, samsung backup, etc. ) Data usage I have managed 53 gigs over 3 months on the Mobile Data, and 5 gigs on wifi. I often use navigation too.
Right now I'm sitting a little over 2 hours screen on and over 2/3 battery left at 6h 37 min since unplugged. So I'm currently looking at ~6 hours screen on after ~19.8 hours unplugged when my battery finally dies.
Interesting thing is web browser and amazon kindle are not listed on my battery page even though I used both this morning. Kindle about 1 hour and web browser for about 1.5. <shrug>
Screen 73%, cell standby 21%, OS 3%, system 2% and idle 2%.
I do always make sure I don't have any wake locks. My awake and screen on match virtually perfectly. I have good signal, maintaining 4G basically everywhere around here ( Verizon. )