It depends according to the condition of the battery and you can improve the battery life by keeping the phone as near as to room temperature, avoid exposing to extreme heat or cold, Close background apps, Use low power mode, turn off GPS and other networking feature.
Looks normal for auto brightness or mid level. Something I don't often see mentioned in battery issues & questions is brightness setting. That makes a huge difference! I've gotten used to using all my iPhone's and iPads with brightness all the way down, unless I am outside or reading. It seems as if it uses barely any battery in comparison to full brightness, where you can practically watch the battery go down (I always set battery to show as percentage beside the icon in status bar) I'm typing this with brightness all the down. I'm going to be reading and drawing so I just quickly pulled up the bottom bar to nudge brightness up a tiny bit.