hmm, yeah I imagine time passes pretty slowly in the frog. I mean, basically immediately after creating Universe B, Bec Noir came out and wrecked the trolls' shit, and after what, like.. a day or so? he destroyed the universe, so all of human history, and years in the future was basically just a couple days or less from outside the universe

It’s hard to tell if it was ‘just a couple of days’ from outside, or if rather, there’s just no correlation to the Time outside with the Time inside- Just like how Trolls can pick any point in the Timeline to Troll in, because they have all of its History laid there before their eyes. In a similar fashion, post-Credits, Jack Noir had barely spent a little while regrouping with the Felt, and in the Frog it had been already 1000+ years since the Kids won the game.