One way us to enable Developer Options where there is an option to keep the screen awake while charging, but that may be of no use to you so I’ll move this to the Note 8 forum.
You might have to go into rooting and custom rom option for that I think.
Just out of interest, how long do you need screen on time for and what do you do that requires it on for >10 minutes?
The screen won't turn off if you're watching videos or something that go past the 10 minutes. Android will keep the screen on when there's a video being played.