I've never pushed my OnePlus One's battery, so I have no idea. Probably a very, very long time, as the battery barely moves unless the screen is in use. I don't think I've ever had my battery level below 50% by late evening, even when using the phone a lot.
This is my current battery:
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This is an old screenshot, the day after I got the phone:
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As you can see, I'm not kidding when I say the battery doesn't move if the screen is off.
Those look really good! But for me to get the full picture, those has to be accompanied by the screen on time at that stage.