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Usually the reason why there is no timeline, because they don't want user hope into those time estimation. Since most case is different, and not the same plus also depends on the trafics too.
The thing is that some customers don't have the patience to wait when they submit a complaint to the casino and also the casino itself delays to get the results faster one way or the other. But I don't blame any gambler or complainer who acts up if their case hasn't been resolved yet because as a gambler it's very painful to have won or requested withdrawal and then the process is delayed although there is almost everytime a vivid explanation to why this is happening.
Quite simple because is gambling, and casino not created any system to lock the balance during withdraw or provided the user with cancel button for withdraw. We have so much story people are finally on losing, due they gambling the money again since they are waiting for case to be solved.