Number of submitted photos in the moderation queue. When will the limit be extended?

Yep. And let's not forget the reason the limitation was established in the first place nor a few previous contributors who had their accounts disabled for spamming. 

Helpful advice! I recently discovered that if only part of the files are accepted, and the rest is waiting: for example, 20 files are accepted, then I can immediately send 20 more files 🙂

Well put. I reached the 501 max quite some time ago and then Adobe started reviewing and accepting my images faster than I could replace them, especially since I got a better feel for what WON'T be accepted and I began spending more and more time editing assets before submission. For food, backgrounds, animals, etc., 30 minutes sounds about right for AI (and I'm guessing the OP is doing AI as well, if they're concerned about when the 501 limit will be increased). But since I specialize in photorealistic portraits, fashion, and people in general, I worry if I spend less than an hour or two editing the same. Fixing dozens of fly-away hairs alone can take 30 minutes., especially since AI has a habit of making sure those hairs cover the subject's face, neck, and eyes.

Anyway, point being, for about every 6 or so images accepted daily, I manage to submit 5 or 6 just trying to keep up and I'm down about 350 assets from my 501 max. If that's what it still is. It's inconsquential in the overall scheme of things.

Thank you!