How long does it take for a club to go away once when its reported?

I think a club isn't going to disappear if only you reported it.
If it's a repeated club, the odds to go away are higher than if it's not a repeated club. But having one person only reporting it, doesn't do anything.
If 你 made it and want it gone, I suggest 你 to message one of the F4 asking to remove it.