I think his health benefits would get cut during this time. And can you really get 2 years off work for being burned out? I have no idea, but my understanding is you need some serious doctor notes to get classified as disabled.
If one is still sick after 1 year one can apply for permanent disability. Permanent disability will probably be around 66% of one’s previous salary, but no less then 25 000$ per year and no more then 65 000$ per year. One can additional apply for some special benefits like housing subsidy, child benefits etc if needed.