Okay, so I have been suspended twice in the past year. I can't remember the exact details but roughly the following was what happened:
hh:mm posting a picture of a monkey/hitler in a dress out of boredom
hh:mm + ~10 min chatting as normal
hh:mm + ~20 min went away to make some snack, BBQ some marinated meat
hh:mm + ~50 minutes coming back to the screen, was told by the chat that I was banned for 2 minutes
Went back to rotate the meat on the BBQ, making a drink
Came back to the PC ... the ban was long gone.
Now, auto chat bans takes 5 flags. For something that is not really offensive, it could take up to an hour for the ban to kick in. By then the poster could be long gone.
And the ban itself only lasts half an hour.
It's a bit like trying to slap a running horse. By the time you sight the horse and try to land your hand on its juicy butt, it already went by and all you get to touch is the tip of its tail.