Right now it's the vanilla turns setting, but probably with the next update it will be 4 turns per year, with 1 winter turn when everything turns to snow and campaign movement will be greatly hampered.
One thing you might want to try to do is find the precise point, or "character limit", at which the game begins to crap out. I am curious about the relevance of twice-listed "Hoplitai". I originally added it when making placeholder unit descriptions, as a convenient one-word title which I could cut and paste and then rename to its relevant unit names. After all of the unit descriptions were added I thought to remove it.
What will really mess with your mind is when you find that 'character limit' breaking point. Because it may crap out at that point, but if you add more characters to another unit description it may accept them there.