Spoiler:
he recently took attack from superboy prime who is mad pre-crisis level(planetbuster/mover). Dunno if that might be PIS though, but if it's not and it's admissable, he is damn durable and might take many people here
Otherwise i'd say he stops at savage or maestro depending on how he treats the fight and how long he'd prolong it. If not then, i'd say he's stop cold at his tracks when he faces Gladiator