Yesterday, I reuploaded my parks with a new renamed file name in order to avoid any confusion. I was wondering how long does it really take for my old posts to be deleted because they have been "marked for deletion" for a while and I don't want to have any duplicated uploads and confuse anyone.

I have some that have been marked for a while. Just give a heads up on the old one about the re-upload until the old ones are deleted.