So long as you meet the eligibility & program thresholds, you can expect to hear back in a month or so. Note: all applications are still manually reviewed, so it does take a bit of time! If it's taking longer that likely means your channel is being held for a second review.
@TeamYouTube Dear Youtube Team
I have reached 4000 Watch
hours and also completed my 1000 Subscribers. My request you to please review my channel and enable monetization as soon as possible. Thanks Dear Team YouTube
Channel name: Atul Tech Bazaar
URL: https://www.youtube.com/channel/UCq4kNDYUd0ql8Px0Y81hpsQ …pic.twitter.com/6zJM5gvynr
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Thanks Dear YouTube Team

I'm waiting for your reply....Love You
End of conversation
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