I don't know how you do that tbh.
I took my phone off the charger at 9 pm yesterday, had it set to flight mode for the night and it was still at 100% this morning when I activated it at 7.30 am.
Now it is shortly after 12.30 and I am at 84% - meaning it has lost 16% or 3.2% per hour since!! I have NOT used the phone in any way in these 5 hours, it has just been sitting on my desk.
Apps' usage of the battery has been negligable, and my On-screen-time in the last 24 hours was a laughable 10 minutes!!
If that is considered "normal" battery drain, then that is super disappointing to say the least. I'm seriously considering returning the phone right now. I couldn't even use it for longer streaming of music or videos, that would probably end the battery in an hour or so.

