How deep into earth’s surface might a very massive batholith extend?

Many kilometers into the crust

Explanation:

A batolith is a large intrusive plutonic body with an outcropping (or potential erosion outcropping) area that can extend for many miles into the earth's crust. More simply, we can say that the batolith is a gigantic mass of rock, which was formed by the cooling of the magma upon reaching the earth's crust. Batoliths are rich in felsic rocks, granite, quartzomonzonite or diorite.

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any abiotic or biotic factor in an ecosystem that causes a population's size to slow or decrease is a limiting factor.