what do you mean screen on time? The screen is off and comes on when i pick up the phone. its sitting on my desk in front of me and i use it when i want to use it. I have not changed my behavour since getting it. I even went out dinnertime and had it connected to my cars bluetooth playing spotify. Does that help you?
Screen on time is a good way of decerning how the battery life is really doing,
go into settings,
battery usage, then post how long you have been using the device (not just idle)
This is a screen shot from my note 9. Here is the screen on time
The UK s10e received a firmware update today. Hopefully this might fix the power drain. Check your phone's to see if there an update for your S10.
I would still cleat the partition cache once the update had fully installed.