It takes longer than you might think, depending on the person who receives it. If the person fails to respond, we send a reminder to them, if they don't respond to that, we might take it offline. If a person responds and says it's correct then we assess it, if they say they've changed it, we check that out.
If someone receives about twenty on one quiz, then we go in and nip it in the bud. It can sometimes be a technical problem.
Give the person a bit of time to correct it though, I can't take something offline until they've had a chance to look at it.
In general you can see pretty quickly if several people send the same correction that it might need taking offline.
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I was born under a wandering star.