As a subject matter expert in philosophy and theoretical physics, I can tell you that the concept of eternity is not a quantifiable duration. It is a philosophical and often theological concept that refers to something that is unbounded by time, everlasting, and without beginning or end. In the context of physics, the term "eternity" is not used because it does not fit within the framework of measurable time.

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It's one hour deep into the earth, one hour up toward the sky, one hour long and one hour wide. To this mountain comes a little bird, once every hundred years, to sharpen its beak. And when this bird has worn away the whole mountain, the first second of eternity has passed."read more >>