The New York Times was the first to report in 2017 that Trump watched between 4 and 8 hours of cable television per day. Trump dismissed the reports as fake news.

During a September 10, 2020 press conference in which Trump responded to claims that he called fallen US soldiers “suckers” and “losers,” he named some 8 hours of television programming he’d watched the day prior.

The New York Times – Inside Trump’s Hour-by-Hour Battle for Self-Preservation
The Hill – Trump watches up to eight hours of TV per day: report
The Hill – Trump: I don’t watch much television ‘primarily because of documents’
New York Magazine – Trump Binge-Watched Fox News All Night, Woke Up to Watch More Fox