That isn’t how that works. A behavioral warning is just a warning that lets you know that your activity is being reported by your fellow players as a means to encourage you to look at that behavior. If you continue to receive reports then yes, we may need to step in and look into those reports but otherwise, if no other reports are received it will fade.
It isn’t something that is going to be hanging over your head for the next month, 6 months, etc…