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Spark plug fouling - real world experience question

Hi there, I currently work on implementing Spark plug fouling at the FlightGear C182s.
I already know the factors leading to it and how to remedy, and there is also alot of videos showing fouled spark plugs and the behaviour of engines suffering it.

What i don't know, however is:
- how common is this ocurring?
- how fast does fouling develop usually (in minutes) when idling rich on the ground?
- Is it easy to trigger, or is it a thing occuring by chance (ie. when idling at the stand for, say 10 minutes at 800rpm at an average day, is it by pure luck to foul a plug? or can you reliably trigger this?)
- How much of a factor is OAT, (I think it should be great, because the plugs are starting colder?)

In short: I need some real world expertise to implement the effect, especially the tripping part.

Thank you in advance :)