[Daerana]

yay for technology!!!   []

[Chemistry4me]

Speaking of technology and getting back to the question: How long would humans' mark be left on a planet with no humans?

Forever! Because there'll only be robots.

[Daerana]

they're not quite human I don't think but anyway, human programming will still be visable in them, and they would possibly last if they evolve enough to be able to figure out how to repair  themeselves.  They could possibly form a whole new civilization!

[Daerana]

Did you watch the youtube link? That has some answers I think as to times.

[Chemistry4me]

They don't need to repair themselves, they just build new ones!

[Daerana]

very true.  Yet, how would they know how to build themeselves if they do not know how they themeselves were built, and therefore how to repair themeselves?  It would be wasting valuable parts if they were to just start again from scratch.

[emelymorris]

What we now have after ourselves, our wealth, until the latter disappears, there will be a trace of a person. I think that it will take only a couple of thousand years until everything disappears, I take into account how much plastic even decays for about 1000 years. A couple of thousand years is very long for humanity, but not for the Earth and the universe, so our trail will disappear very quickly.

[Bored chemist]

I think that it will take only a couple of thousand years until everything disappears,

Stonehenge has been here for twice that long.
If we all disappeared, there's no reason to suppose it wouldn't survive another 4000 years, is there?

The oldest hominid fossils are very old.
There are a lot more people about today than say 50,000 years ago.
Some of us will leave recognisable skeletons which will last for at least a million years or more.
https://www.eurekalert.org/news-releases/546040

And then there's nuclear waste...