Real life experience...
Last fall, went to a football game with a group of friends. We left home around 9am and didn't get home until after 7pm, so it was an all day affair. Of the 4 of us, the phones were as follows: 1 Samsung GS3 on Verizon (mine), 2 iPhone 5's, 1 iPhone 4S. To best of my knowledge, all 4 of us started the day with a full battery.
None us were using our phones very heavily throughout the day, as we were preoccupied with our own tailgate and the football game, but we all were texting here and there, checking fantasy scores and stuff like that. I remember that I was checking my score a lot because I badly needed a win to make the playoffs in my fantasy football league, so I was watching scores closely.
Long story short, by the end of the day after the game had ended and we were getting ready to drive back home, all 3 of my friends had either dead batteries or <10% remaining. 2 friends had to borrow my phone to call their wives...and were shocked to see that I still had around 50% battery remaining. I even pulled NFL Mobile app on the drive home so we could see the end of the late NFL games.
It was pretty awesome as this group of guys I was hanging out are all very much pro-iPhone and would joke with me about owning Android...but they weren't laughing when they had to borrow my phone because theirs was dead after a being away from a charger most of the day!