Most eligible channels hear back in 30 days. Note: all applications are still manually reviewed, so it does take a bit of time. Hope you hear back soon – in the meantime, here’s more info about the review process: https://yt.be/help/YPP-review
If you haven’t heard back yet, this means the team didn't reach a clear decision during the 1st review, we’ll put more effort/resources into the final decision. There’s no way to expedite this, hope this helps clarify.