I live in the marginal subtropics in an area with subtropical rainforest. There is a severly degraded historical landslip at the back of my house which we've b

I live in the marginal subtropics in an area with subtropical rainforest. There is a severly degraded historical landslip at the back of my house which we've been working on for 12 years or so. After getting rid of the gross weeds, it only took a couple of years for a bunch of native rainforest species to start popping up, but it's going to be a very long time before what they call "ecosystem function" is approximately back to the way it was before. You can reduce this time in the tropics because the carbon cycle is so fast, but it's still going to take many years of restoration. Appropriate management can speed things up, but only so much - and the techniques used vary in effectiveness.