I don't think you can have such a number, as it hinges so heavily on unknowable future usage and environmental factors.
And frankly now that sudden shutdown isn't a thing, I don't think it matters much. Apple just has to communicate the situation better when processor throttling reaches severe states.
And frankly now that sudden shutdown isn't a thing, I don't think it matters much. Apple just has to communicate the situation better when processor throttling reaches severe states.