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hundreds of years
This depends on what type of topsoil, its composition, the surrounding climate, etc. But usually it'll take about 800-1000 years for an inch to form.
350-500 years
It depends on where your at, in the rainforest it can happen in a year, while in other places take hunreds of years.
100 years
6000 to 12000 years ago.
There is no guarantee that it will ever recover. The layer of topsoil in a rainforest is extremely thin. Because there is so much competition for food in the forest, little material builds up to form topsoil. When the trees are cut down and the thin layer of topsoil is exposed to sun, wind, and water, it is more susceptible to erosion. When the topsoil disappears, the land becomes un-arable, and becomes essentially desert.
Depending on geographic location, the natural build-up of one inch of topsoil requires about 400 - 10,000 years. Certain locations can require less, and others, even more.
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