I think Trump will drag it out beyond that point. Even if the media turns against him and stops granting him airtime, he still has his own communication channels. The man will never, ever accept that he's been defeated in anything, or that he's been wrong in anything. Can you imagine him admitting that he called wrong on even the most insignificant event, such as a coin toss or a dice roll? Let alone that he's come second in a two-horse race with the whole world watching on.

For Biden supporters the election has two possible outcomes:
Biden wins
Biden loses

For Trump supporters* the election has two possible outcomes:
Trump wins
Trump wins but is cheated out of victory

*_{Not all Trump supporters, obviously. But the loudest ones tend to grab the attention.}