Create a notification when reaching 20 download attempts

[MStritt]

I'm looking to create a notification, when 20 download attempts (knowledge articles) are made by any logged in user (Customer Support Portal) during a 24 hour period. How/where would I run a query to provide/show that information? And, tie it to a notification?

[MStritt]

I'm looking at Download Sessions (u_download_session), and it shows the download sessions, the contact name, file name, created, etc. But, not sure how to configure a report from that table that would show me just downloads by the same person in a 24 hour timeframe (created date/time would be within 24 hours).