If watching baseball all day is a thing that you would like to do, the first day of MLB’s postseason will have you covered. Games begin at 12, 2, 4, and 8pm Eastern. Well, they’re scheduled for :07 in each of those hours, but you know what I mean.
That’s a lot of baseball, although probably not technically nonstop baseball since there’s a big gap there between 4 and 8. It’s possible, though - last year’s one-game NL wild card between the Dodgers and Cardinals took four hours and 15 minutes, most of which was played with the game tied at 1-1, before the Dodgers won it with a walkoff dinger with two outs in the ninth.