Just died on the 22nd wave of solo run and wonder how far was I from the finish
Didn’t you already “finish” zombies? Correct me if I’m wrong, but Moon Lord spawns at Round 20. After that, there are only Diabolists and Paladins for perpetuity.
Yeah, there is no limit, technically. It’s a battle to see what gives up first, be it you, the server, or your internet.
While r20 contains the final boss, the final challenge should come in the form of your health being removed. After that there are no special removals, bosses, or changes in enemies.