how long to approve new submissions

The solution is to wait your turn. Especially, assets in the illustration section are currently experiencing a longer than expected waiting time. We currently estimate the waiting time to be about 2 months. However, we cannot say whether the waiting time for assets submitted a month ago will still be extended.

The long waiting time is due to the massive submission of generative AI content. Some users submitted thousands of assets in a range. As Adobe could not add resources at the same pace, the moderation time expanded slowly.

It takes as long as it takes. There are hundreds or thousands of assets ahead of yours.  You must wait your turn like everyone.

On average, Photos & Vector Graphics are reviewed in 5 - 15 business days.
Illustrations & Generative AI could take 1 - 2 months due to an immense backlog of AI submissions.

AI submission guidelines.
https://helpx.adobe.com/stock/contributor/help/generative-ai-content.html

For faster turnarounds, submit fewer generative AI. Focus on quality instead of quantity. 😉