I dont see that is possible unless the phone is running whole day on 0% brightness with airplane mode on.
Is there any trick I'm missing on or what?
yes, root your device, install trickster mod, and put your cpu with noop and governor ondemand and min. 374mhz max. 1574mhz, and your gpu on powersave profile with 330Mhz on GPU! and of course lowering the brightness depending of your needs, if yu are outside you need to raise it, but if inside you can lower it!
i have ~6:40 OST with that settings
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