deleting an apple id by apple service
How long do I have to wait for the apple id on my phone to be deleted?
How can I check if the uploaded documents are sufficient to remove the apple id?
iPad, iOS 8
I don't know. Apple only lets me get so far into their service link before I actually have to make a request which I don't need. You probably know more about it that we do since you have used it. If it doesn't say anything in what you have seen then likely nobody here knows, particularly not about the documents (if you end up finding out then please post about it here so we can help future users with this question). I have seen a few people comment about how the service can take a week or more but unless Apple specifies a time then I guess it is open-ended.
https://al-support.apple.com/#/additional-support