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Nothing else? No music or using other apps? I'd say 2-3 hours screen on time is the average. It is really hard to say if you have normal battery drain cause it depends on what a user is doing on the device.
Just because you're doing little else on your device it doesn't mean it won't consume battery. You can check running apps via the developer settings>running apps.
Try doing a bit of experiment, compare your battery drain overnight
1. 100% charge whilst on safe mode
2.same but in normal boot mode
You will see that the drain will be more evident when there are apps running compare to when it is on safe mode (where only basic apps are available)
In a normal day my battery goes from 100% to 70% after 15 hours on. Sometimes it's at 80% after those 15 hours. If I use the phone a lot, I still have about 40-50% left after 15 hours of use. Battery comsumption is affected a lot from background processes, mind, not only what you are actively using.