And which was the characters that stood there longest?

Hard to say, but I think for the longest character I've had, at least two in-game years had passed.

I have my tinescale set to 3 (the default is 20) so time in my games moves very slowly. In the time it takes a vanilla character to experience two years of in-game time my characters experience a few months. If I had to take a guess I'd say that eight to eleven months is probably the absolute longest any of my characters have existed.

But to be honest I don't really pay much attention to time passing in-game. I am barely aware of night and day cycles most of the time. I usually have no idea how many weeks or months or years pass in my games.

18 moths is my record with my god orc.. he did almost all quests and discovered all locations on map - to be honest, I don't really check calendar in game and this is the only one character who lived so long ingame...

How do you set the timescale and is that something you can only do on PC or with a mod?