Not sure if you're asking how long it takes to charge or how long a full charge last wiss "normal" use. I think you're refering to how long it takes to charge, so here are my thoughts in that vein. Remember that charging using a USB port will not charge as fast as using the wall charger. With the wall charger, I can charge the phone fully in less than 2 hours (not sure exactly how long, but after two hours I had charged from 9% battery to 100%). Based off that, the charge rate on my phone is about 10% every 12 minutes. By contrast USB charging is more like 10% every 20 minutes, or about half as fast. These are my observations, YMMV, but it should provide a reference point for what is possible for this phone.