[cmiovino]

There likely isn't any long term damage.

My dad was driving me back from the emergency room once in our 2000 Camry and going up a long hill with a bunch of turns, the coolant gauge literally was pegged to the max. I told him to immediately pull over and put the hot air on, but he kept going because "we're just a few miles from home". Drove another ~2.5 miles with it more or less pegged there and sometimes fluctuating down partway.

Got home, engine was clicking after turned off - you know, from all the heat. You could feel it radiating off the engine with the hood up in the garage a ton, way more than normal. Coolant overflow was empty.

Filled it up, burped the system, it's still running just fine. Never just keep driving, but at least with a Toyota inline four, the sucker kept going with zero issues.