1.5 days = 36 hours. Sorry for that brainbuster.
Let's use a real world scenario of a Friday or Saturday for people who have a life and wouldn't be tied to a charger. Go to work, lunch, work, happy hour, out for dinner, club/bar/sporting event. Phone is easily dead before the end of the night. You have to take into account weak signal because of Sprint's admittedly spotty coverage.
Sure you might be able to "access to some power source" but how much fun is that to hunt for when you're out trying to do stuff? Sorry didn't get your message cuz my phone was dead since I decided to not find a power source.
I'm not quite sure why you're acting like the one appointed to determine what "most folks" need in a battery.