How long is forever?

It's longer than you
Longer than me
After my heart stops beating

Longer than love
Longer than hate
After my feeling for you have fade
And I can't remember your name

Longer than my bones
And my veins
And the compacity of my soul
On end to end

Far longer than the earth
After the sun has got to rest
And longer than when the red glow
Is all that is left

And when the universe shrivels to dust
And if it begins again
Or if it grows with nothing but darkness
Forever is longer than any of those put together

How long is forever?
I don't know
Maybe it really is
When our hearts take the final beat