How to adjust end-game-crisis chance or time?

[cy-one]

After the game suddenly decided it's time for an endgame-crisis (I was an "okay power" on the galactic stage... By far not the strongest, but also not the weakest) when I was at 30k navy strength, the game... Well, factually ended.
My 30k-fleet barely won against the first 30k-invasion-fleet, but wouldn't stand a chance against the next 30k-fleet.
And then it's game over.

I don't have allies, but some vassals. But as there isn't an actual war going on with the aliens from outa space, there's no "bounding together."

Anyway, I want to either reduce the chance it spawns, or preferably adjust the criteria WHEN they spawn... Where can I do that?

 

[cy-one]

Small bump.

Knowing just a liiiiittle bit about how PDX events work... I could prolly turn up the "mean time to happen", but where is that?
Also, is it the only way to reduce the chance of it happening?

 

[Warial]

Changing mtth of crisis.12 in crisis_events_1 file should do the trick.

 

[cy-one]

How does mtth exactly work? As far as I understood, it's an average, which means it can happen earlier, but also later.
Question now is, how large is that "spread"?