Where ( u ) is the number of uses, and ( \lambda ) is the leakage coefficient—a number you must empirically measure, because every system has its own.

The formula is no longer:

So when you generate that new RSA-4096 or Ed25519 key, do not ask "How long will this last?" Ask: "What is its half-life under load?" And if the answer is less than the life of your session, you are finally building for the world as it is—not as 1.0 wished it to be.