As a referee it takes time to approve a request. Speaking for myself, here are some things that delay a request.
Just my personal life (work, family, holidays)
May have to edit the photos (which takes time and can not be done on my phone)
Research in a reference I own (locating the submission in the references)
Research in a reference I do not own (Requesting someone else help in researching a submission and then waiting on a reply)
I find many submissions with the source “from my personal collection” as a source, or something similar. Then I have to search the web or other material for all the information that the member did to identify their own submission.
That is just what I have experienced as a referee.