I am overclocked to 250-900. My phone would not last 12 hours the way I use it. I can't tell you exactly, but I am at school all day, texting, IMing, emailing, browsing webz, taking pictures here and there, and def listening to music/internet radio... Basically, raping my battery

Maybe next two weeks I will leave my home in the morning with my phone charged all the way, and make logs of my battery graph and how long my battery lasts...