Most channels hear back in less than 30 days. Applications are manually reviewed, so it does take a bit of time. Hope you hear back soon. Here’s a bit more info about the review process: https://yt.be/help/YPP-review
Dear YouTube team, according to YouTube policy, a user must have 4000 hours of watch and 1000 subscribers to earn money, as I have already reached 4000 hours and have completed 1000 Subscribers. Please review my channel and enable monetization as soon as possible.pic.twitter.com/dPhVCEDQFu