how long does approval take for models / sprites?

[unbecomingname]

The admins down at Models-Resource have a lot on their hands in terms of models, and it takes them quite a while to get through a batch of them. I uploaded a few of my own rips (Which were unapproved sadly because of a transparency issue) around mid-February and hadn't gotten a response on them until about a week ago.
In short, model-approval takes quite some time, and I would just be patient until they get back to you.

And I assume the same situation goes for sprites as well.