If all human life was gone from our planet, how long before all traces of human life disappeared?

Question

If all human life was gone from our planet, how long before all traces of human life disappeared?

Answer 1

That's rather like the old question, "If a tree falls in the forest and no one is there, does it make a sound?"  Anyone who answers this question COULD answer correctly.  However, we will never know; will we?

Answer 2

Nothing will last forever but I would say a VERY long time. Even dinosaurs are still being found. Eventually it would slip thru the techtonic plates and burn up in the mantle.

Answer 3

Forever. Things like Styrofoam last forever...