We do this regularly, while there's no timeline or time frame, this is done regularly to ensure spam/inactive subscribers are removed. Here's a Help Center article which has more about this: https://goo.gl/2aEwWR . Hope this helps!
@TeamYouTube Does YouTube remove bot/fake/spam subscribers?
If so, how long would it take?
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Thanks. Hoping the botted subscribers on my channel get removed soon. So. I have made. Backup channel for now :)
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