The phrase "a decade of study" is correct and usable in written English.
You can use it to refer to a period of ten years spent on academic or research-related activities.
Example: "After a decade of study, the researchers finally published their groundbreaking findings."
Alternatives: "ten years of research" or "a ten-year study".
The paper, Schaffer said, is the culmination of approximately a decade of study, data gathering and analysis.
After a decade of study, nostalgia isn't what it used to be — it's looking a lot better.
Despite almost a decade of study, several questions persist about the prediction of these responses to inlet perturbations in industrial reactors.
The law, adopted after nearly a decade of study and impassioned debate, called for the report issued today, and said a finding of bias would require Congress to consider a bill to repeal the penalties for hiring illegal aliens.
After more than a decade of study, he returned in 157 ce to Pergamum, where he served as chief physician to the troop of gladiators maintained by the high priest of Asia.
In most industries, this is plenty of time, but it can take a decade of study to get a new drug to market.
After nearly a decade of studying Steiner's system, Harry and Li returned to Chengdu, to start China's first Waldorf school.
A review of almost a decade of studies found that exposure to violent video games was a "risk factor" for increased aggression.
Mills's mind-games magic – from cracking the codes of jewellery shop safes to predicting the sex of babies at antenatal yoga classes – come from more than a decade of studying the "predictable" patterns of human behaviour.
Results from more than a decade of studies suggest that the Bt crops themselves have at most a minor effect on nontargets.
In 2006, an American Heart Association advisory panel reviewed a decade of studies and determined that soy products had no significant effects on HDL ("good" cholesterol) or triglycerides, and little or no ability to lower "bad" cholesterol, or LDL.
