With all the complaints of the battery life, I had to go back and look at the Spec sheet for the iPhone 4S and understand the words that are always present on these smartphones to cover their rear ends when we don't get what we think is advertised... 
Me thinks Apple turned everything off to get the UP TO figures.
http://www.apple.com/iphone/specs.html
Talk time: Up to 8 hours on 3G, up to 14 hours on 2G (GSM)
Standby time: Up to 200 hours
Internet use: Up to 6 hours on 3G, up to 9 hours on Wi-Fi
Video playback: Up to 10 hours
Audio playback: Up to 40 hours
Me thinks Apple turned everything off to get the UP TO figures.
http://www.apple.com/iphone/specs.html
Talk time: Up to 8 hours on 3G, up to 14 hours on 2G (GSM)
Standby time: Up to 200 hours
Internet use: Up to 6 hours on 3G, up to 9 hours on Wi-Fi
Video playback: Up to 10 hours
Audio playback: Up to 40 hours