A long time because they do not triangulate multiple news sources, and have a deeply paranoid conspiracy theory, shared by the president, that the main stream m

A long time because they do not triangulate multiple news sources, and have a deeply paranoid conspiracy theory, shared by the president, that the main stream media cannot at all be trusted. It's entirely plausible they will not ever feel they've been had, because it'll all just be seen as the "deep state" destroying a president. Contrary information results in cognitive dissonance and the contra agent is to filter out sources of contrary information.