It’s been observed there is an average time lag of around one to three months before obvious trends observed to insider becomes apparent to mainstream media.
Examples
New Blow to Hedge Funds as Software Darlings Start to Crumble
https://www.bloomberg.com/news/articles/2019-10-19/fresh-blow-to-hedge-funds-as-software-darlings-start-to-crumble
https://www.bloomberg.com/amp/news/articles/2019-08-07/home-prices-decline-in-some-of-the-costliest-markets-in-the-u-s
https://www.bloomberg.com/news/articles/2018-01-24/san-francisco-s-sky-high-office-rents-to-slip-as-building-peaks