How long or short should your first appeal letter be?

I have read several different opinions on this question on this site. The sample appeal letter posted is quite long. I found a Q&A about an appeal letter. One person answered saying they used to work at an insurance company and said to keep the letter short and to the point. Only point out your own personal physical problems and not to quote publications or anything that would help out your cause. I just got my first denial, which was totally expected, but now I'm confused about how to write the appeal. Any help would be greatly appreciated. Thanx!

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