Depends on what is it used for and water quality and if it was installed properly .Is it waste, soil, vent , condensate? or used as a hand rail or monkey bars?
What kind of pipe? Is this area exposed to acid rain?
Unopened potting soil can last indefinitely if stored properly in a cool, dry place.
black soil
A pipe extended above the roof level is a soil pipe.
Another name for black soil is "regur soil" or "black cotton soil."
No, that is why it is called a vent pipe not a soil line
Soil pipes and waste pipes differ in their purpose and the type of waste they handle. A soil pipe is designed to carry human waste and toilet paper from toilets to the sewer system or septic tank. A waste pipe, on the other hand, is designed to carry other types of waste, such as water from sinks, showers, and washing machines. Waste pipes can also carry food waste and other debris from garbage disposals. Additionally, waste pipes are typically smaller in diameter than soil pipes.
top soil is impotant because with out the soil the roots wont grow and the plant needs roots and soil to become a butiful and good flowr that will last long
Coal tar
If you find a long black worm in your garden, it is likely an earthworm which is beneficial for the soil. You can leave it be as it helps with soil aeration and nutrient cycling. If you are concerned, you can gently move it to a different area of the garden.
The lifespan of soil varies depending on factors like usage and management practices. Generally, soil can last for hundreds to thousands of years before needing replenishment or replacement.