So, I'm getting 5 hours of screen on time on my more than 2 years old S20+ with One UI 5.
On One UI 4.1 I was getting 4 hours screen on time. So it is improved now.
Settings on my phone - FHD with 120hz
Note:
(in screenshot it is showing 4 hours 58 minutes but actually it is close to 5 hours 15-20 minutes because I checked at 11% battery then also 4h58m was shown but I continuously used phone for 15-20 minutes but my phone didn't update screen on time for some reason).
