Share your experience!
You should reset stamina mode,but if it says only 2 days it means that is how stamina can moderate your usage to gain more life.
To reset stamina,do this: first disable it,after go to settings-apps-all-eco mode controller,force stop and clear data.Restart your device.
It certainly does work; as Stamina mode learns over time based on your usage resetting it will restart this learning process.
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It is useful,I get many days on a single charge,it disables data,which is important,while the screen is off.As Sam said,resetting it means it will learn your usage again and help you save battery.