1 game enough for a ban?

Captured with Lightshot
So I received a ban earlier today. 14-days since it's intentional feeding. Did I deserve it? Yes. I'm just curious that how many reports it usually takes for a ban/warning. And in cases of intentional feeding do you receive a ban immediately or should I receive a warning first? And especially when it occured in a situation like this, after 1 game.
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