Depends on the issue and any investigation required in order to determine a decision. Also some modes of contact appear to be quicker than others, two of which are Twitter and Facebook - have a look at the contact options via this link - Contact Airbnb
I read on the Airbnb website that they usually or generally resolve the issue within a timeframe. I can’t remember for sure if that was a few days or a week. But I am currently having difficulties with a resolution case. And I had one on a reservation that was at the first of this year that took longer than was stated. Does anyone know where this is or if it has been revised and no longer mentions how long that getting a decision generally takes.