The phrase "accumulated for years" 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.
Example: "The knowledge he accumulated for years finally paid off when he passed the exam with flying colors."
Alternatives: "gathered over the years" or "built up over time".
The problems had accumulated for years.
Evidence has accumulated for years that networks controlling many of the country's critical systems, including the financial system, transportation and power grids, may be vulnerable to digital attacks.
Finally, the immunosuppression accumulated for years and the difficult access to antiretroviral therapy favours the transient rise in T. cruzi parasitaemia from cryptic to higher levels, causing injuries in different organ systems and neurologic symptoms in 70 85% of cases [ 40], cardiovascular symptoms in 10 55% [ 39], and gastrointestinal symptoms in lesser extent [ 16, 44].
I saw the source of the stench: a spectacular mound of garbage that must have been accumulating for years.
G.M.'s problems in Europe have been accumulating for years, industry analysts say, and will not be fixed easily.
Dr. Park said that, even at the current price, most of the Berkshire stock he has been accumulating for years are "still way ahead".
The evidence that hybrids might be hard to hear coming has been accumulating for years, though it wasn't until the National Highway Traffic Safety Administration recently released a study that the full extent of the problem was revealed.
The sludge had been accumulating for years near the Kingston Fossil Plant, run by the Tennessee Valley Authority (TVA).
Evidence has been accumulating for years that earthquake faults previously seen as separate could join together to create an earthquake more powerful than expected.
Sperling told the Detroit Free Press on Thursday that the $25 million to hire as many as 140 new firefighters had "been accumulating for years" but could not be accessed until now.
Evidence for local c-di-GMP signalling by DGCs and PDEs that operate on separate targets in parallel with little or no cross-talk has been accumulating for years.
