What does e.g. 108.53 mean? Is it sort of in-game time? And how does that translate to real time?
Thanks a lot!

Looks like a duration in minutes.seconds
Is a duration of ~1h50 coherent with your play time on this saved game?

No, that would be quite longer.
So supposedly the ingame time is counted differently...

The timestamps from in-game let you know how much ingame time has passed. As an example: Day 3 16:03 would mean that three days 16 hours and 03 minnutes had elapsed from the time that The Nameless One first woke up on the slab.

Normally it is about one minnute real time = one minnute game time. Conversations paues the game clock, some other things do as well. Area transitions can cause a time-lapse, repeserating the time spent moving from one area to another area. Another thing is that when you rest the ingame clock will skip foword about eight hours.

This is the best explanition that I am able to give. It may not be very choerent to anybody not reading my mind. :(

Thank you very much, that helps!