If you search around, there's a lot of information about a woman who had a Stang with 600,000 miles on it. Perhaps that establishes one end of the spectrum.
You never know --- well cared for and maintained, cars/engines can last a long time. The record holder is this guy -- Irv Gordon's 1966 Volvo P1800 is probably going to turn over 3.0 MILLION miles any time now. Last I spoke to him -- it had the head off at 700,000 miles. They did a valve job - but the bottom end was solid so they left it alone. Repaints - yes. Clutches - several. Transmission rebuilds - one or 2. But the bottom end has 3 million miles and the head has 2.3 million miles. He follows the factory's service recommendations - all service done with Volvo parts. I think he's been getting parts for free since he turned over 2.0 million miles back around 2002 - Volvo gave him a new car for that feat. Not sure what they'll do for 3.0mm.