As I wrote, nobody publishes exact numbers on this. There’s reasonable room for error though because most people never go beyond 300-400k during the lifetime of a car. Packs generally go longer than anticipated a few years back, such that a broken pack is no longer a real concern for most cars starting, say, 2020. There was a lifetime issue with the original Leaf, but they seemed to have fixed that in later versions.

It’s also somewhat moot to worry about this - if you need to charge en route, you’ll fast charge. If you’re at home, you’ll charge slow. You won’t go out of your way to fast charge since it’s expensive. Except if you don’t have a charger at home, at which point you don’t have a choice anyway.