How long does it generally take for nonrenewable resources like fossil fuels to form?

Answer

Geologic timescales, often hundreds of millions of years.

Nonrenewable resources are defined by their slow formation from ancient plant and animal life, taking hundreds of millions of years, meaning that once consumed, they are gone on any meaningful human timescale.

How long does it generally take for nonrenewable resources like fossil fuels to form?
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