After 30h with my academy the game crashed, it did a several times before but after that crash the game wasn't able to reload the save again. I did weakly autosaves and the game shut down on a autosave day, maybe thats the reason?

The file has now about 800kb, a intact one is about 24MB.

I'm done with the game, i will not Invest another 30h - pity, it's a fun game but that was an absolute killer.