Heya,
I needed to start tracking my screen time after a concussion, and being bad as I am with time management, I learned a bit of Python basics and put together a little tray app.
Would love if anyone could test it on any other environment than mine (X11/KDE) and give me any feedback.
https://github.com/kachnitel/ScreenStatsTray
See README.md or install.sh for details on usage.
Cheers!