Not sure. mine's too early to tell. It's still at 100% and with usage of 25 minute.
I usually am about 30 minutes of usage on my 5S and then it drops to 99
The problem with measuring how long it takes to drop from 100% to 99% is that the phone displays 100% even when it isn't completely charged. Apple made it this way because it's not good for the battery to be fully charged (for long periods of time).
So the 100% reading represents a range of charge. If it wasn't like this, then users would almost never see a true 100% charged battery reading since the battery is designed to automatically stop charging and drain itself a little before recharging up again (and repeat).
So what you think of as 1% drain in 25 or 30 minutes is misleading.
So is your comment.
Your initial comment simply belies your ignorance and -- because of the wealth of information available at your fingertips -- your laziness. It's well established why measuring a 100% to 99% drop as if it was a constant linear relationship is completely worthless. Three seconds of googling would have lead you to the rationale provided by SJim.