I guess we got till November to know how much longer (I mean, then we know if it's till January 2021 or January 2025, as the law will obligate Trump to quit being POTUS anyway, regardless how well or bad he did)... Of course, the true heritage of a president mostly becomes clear when he's no longer president, and then we'll now if Trump was really that bad... And about that period, I'm trying to be an optimist ;)