The phrase "accumulated for decades" is correct and usable in written English.
It can be used to describe something that has been gathered or collected over a long period of time, typically spanning many years.
Example: "The research findings have accumulated for decades, providing a comprehensive understanding of the issue."
Alternatives: "gathered over decades" or "built up over decades".
But that is merely the surface, Han insists: "The tension and terror that have accumulated for decades have burrowed deep inside us and show themselves in brief flashes".
Ground water runoff that had accumulated for decades in the older, higher mine broke into the Quecreek mine, and the men scrambled to find an air pocket.
The spent fuel in the current transfer accumulated for decades in storage pools beside a research reactor at the Institute of Nuclear Physics outside Tashkent, the Uzbek capital.
New York City Transit also collected more than 13,000 pounds of lead waste in 2000 from various sites, as steel structures where the paint had accumulated for decades were stripped and repainted with lead-free paint.
Multiple prognostic models for TBI have accumulated for decades but none of them is widely used in clinical practice.
Evidence accumulated for decades has revealed that GC is an end result of the multistep transformation of precancerous gastric lesions, including CAG [ 3].
I hypothesize that, similarly to diseases like cancer, where the causative mutations can accumulate for decades before the malignant transformation, a long term accumulation of TE insertions in the brain is necessary for the emergence of these diseases, and that their effects reach the necessary threshold only in a fraction of individuals.
The spent fuel that emerges from nuclear power plants has been accumulating for decades in steel-lined pools or giant steel-and-concrete casks near the reactors.
Within its covers, he marshalled the reams of evidence that he had been accumulating for decades in support of his revolutionary thesis.
The two Koreas "will have to do a great deal of difficult work to overcome the mutual prejudice and mistrust that had been accumulating for decades," a ministry statement said.
Leprosy is not fatal and untreated cases had been accumulating for decades, so that between 1956 and 1962 treatment was initiated in 18512 leprosy patients (10113 females), ≈4% of the whole population of Portuguese Guinea [32].
