Yes, I know that
Ok, let me tell you that it depends on which option you use to request a review or to appeal. The times are different with each option.
I have another question about disability benefits, does it apply to my adult children as well?
If you are applying for an unmarried adult child, you will also need to provide supporting documents about the child's disability.  You, as the veteran, should also ask the child's doctor to verify the documents.  The documents should include proof of the date of the disability's onset with a description of the disability, the marital status of the child, and a description of how dependent the disabled child is on you.