I don’t think I’ve ever taken one past 100K - but I had one break at 30K once. It was on a '91 Escort, and was the replacement belt. I can’t recall the brand of belt. Luckily those engines are non-interference - even though the Gates guide says they’re interference.
Oddly enough the owner’s manual for a '97 Escort gives no change interval at all. It actually says to “inspect” the belt at 120K. Very odd. I just go with a change at 100K and haven’t had any trouble. They remained non-interference - regardless of what the Gates guide says.