What happens after round 7?
If we see here, there is 7 rounds mapped for TFT https://lolchess.gg/guide/rounds
But if there's still 2 players alive after 7 rounds, what does the game do?
From what I gathered from Reddit, it seems that if the game continues after Round 7, it just repeats the setup of Round 7. 3 rounds, caroussel, 2 rounds, Elder or Herald.
The game is bound to end at some point, since units are forced onto the board and there is no way that no damage might be done in a round.
Next question would be, how high can you realistically take it?