What ever for
? [Imgur link, SFW; shows my battery stats this morning]
If I can get 20 hours to 30%, I can probably get 30 hours on a full charge. But I put my phone on the charger when I go to sleep. If I didn't, I'd be shooting for a 40 hour drain. That's kind of high expectations for a stock battery. Why not just charge it every time you go to bed?
I'm running the latest CleanROM in Dalvik mode, whatever kernel comes with it and zero battery saving apps. I do have the option ticked as you can see at the link where it cuts off your data when the screen is off (like Deep Sleep Battery Saver, and others). But the battery saver itself is off.
HTC One M8 / Verizon / CleanROM