My bad....using the regular Mate 10...
was able to update to 119 I think a week before... I tested on max resolution with Smart resolution set to ON.
My observation: 1 hour SoT every 10% of battery spent
* WIFI switched ON
* typical usage: facebook (main and 3rd party app - simple for facebook), Instagram, youtube, browsing, downloads via playstore...
I still get an average of 8+ hours of screen on time. Of course less when I play games - average of 4-6hours. Coming from Mate 9, I still find this above average for my usage. I have almost the same SoT average with my Mate 9 - probably just a difference of +45mins on the Mate 9.