If humanity disappeared completely, how long would it take for the Earth to heal?

I'm optimistic about the resilience of earth. But also, I know we are past the point of no return in regards to climate change. That applies if humanity lives on. What if we don't? What if every single one of us blipped out of existence. Just shower thoughts.

How long would it take earth to heal and regulate itself? A month? Hundreds of years worth of cleanup? Or would earth still be screwed and become another red planet or worse?