Yes, workers' comp cases can take that long. How soon a case resolves depends on many factors including, timeliness of an applicant's recovery, whether there are problems with the discovery process (missing documents), among many other factors... For what it's worth, there are many cases much older than 5 years old in the system.
Work comp cases can last for years. Your post makes me think that you do not have a very hood case and you should probably settle. If you cannot prove your claim due missing documents then you may have a loser of a case.
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The simple answer is YES. The case will take, MINIMALLY, as long as you take to get better + time for litigation. It is hard to understand how CO2 poisoning is affecting your health 5-6 years later. Unless you have an expert who can provide causation, I must agree with Mr. Bollinger.
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