Thanks for reaching out–most of eligible channels hear back in less than 30 days. Be sure to look out for an email or Studio notification from us! In the meantime, if you’re looking for general info about the review process, check out this help resource: https://yt.be/help/YPP-review
Sorry to hear you've been waiting for nearly a month, but our team doesn't have specific timelines for individual channels (thanks for understanding). Hopefully you don't have to wait too much longer for your update.