Is there an undocumented web call or some sort of meta API to get all new comments globally in the last N hours?
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There is a comment based tool in the 10k toolkit where you can see the most commented questions today and in the last 2-7-14-30 days
If you view source the page you can see how the comments are fetched. You can only fetch comments for one question at a time, but as long as you weren't fetching them too frequently you could write something to poll each id and update a count. You'd need to also monitor the questions so you would know if they were on questions or answers and what the title of the question was.