Do you think it's normal for a sportsbook to investigate for more than 6 months?
Well, investigating for more than 6 months does seem like quite a long time. But I have seen such cases before. It probably depends on the type of investigation and who is conducting it. It may be a third party security provider so it is out of the casino's control. It does sound a bit on the longer side, though. A month or two should be the maximum in my opinion.
I was just notified that the relevant team will have an answer on Wednesday.
It is very abnormal behavior if the casino gives a timeline of 6 months to resolve a case. Usually, any case should be resolved within 5 to 10 days no matter how complex is the issue.
However, they told you that you will get an answer on Wednesday, meaning that they are working on your issue and hopefully your issue will be resolved in your favor. However, be ready as they can ask you for more documentation plus they can deny your request if they have any proof of yourself violating the terms and conditions of the casino.