Been 20 days for my oldest submissions to Adobe Stock. Have I done something wrong?

What type of assets did you submit?

Submitting generative AI assets has currently a waiting time of one to two months. Assets are moderated in the order they get submitted. You still need to be patient.

I would, however, suggest, you check your submission for errors. This would spare you the refusal and us all a lot of waiting time. Generative AI submission guidelines - Adobe Support Community - 13549435 

If you are a new user and this is your first submission, you also need to check if your ID got accepted. If your ID got refused, you have to fix that first.

It seems from things that other contributors have been saying in this forum is that there is a huge backlog oF AI submissions that are satretching the moderation resources of adobe and decisions are indeed running slower tham in realier times.  There is nothing we can do about it so fretting over it is just a waste of effort.  We will all hear the decisions eventually.