How long does it take for tree roots to weather a rock?

Answer 1

That would depend on the type of tree, I would say. A hardwood tree like an oak grows slowly, and therefore this would take decades to weather rock, while a pine might take a fifth of that time as it grows fully in those same decades while the oak is still only partway into its growth.

Furthermore, you cannot quantify weathering except by the extent of damage.

Some trees, therefore, may take as little as 15 years to do the same amount of damage as another which may take 50+ years.