"has long realized" is a correct and usable phrase in written English.
It is most often used to denote that something was known, recognized or understood at some point in the past. For example: "The town has long realized its potential as a tourist destination."
The Jewish settlement movement, added Mr. Ezrahi, has long realized that in normal times the consensus in Israel does not support its calls to build more and more settlements or to expel Arabs.
'Iran and Hezbollah are an inseparable part of the Syrian atrocities and the world needs to act against them,' the Prime Minister said". Israel has long realized that the devil the world knows in Damascus is worse than most anything that would follow his removal.
Google has long realized this and record labels have started to wake up to it.
Hamdy, a former Wall Streeter himself, has long realized the power of data in the construction business.
Cotillard, of course, has long realized the outfit-perfecting feature that are pockets.
Colorado has long realized punitive drug policies are a major cause of mass incarceration, and recently revamped their entire drug sentencing scheme.
Philosophers and psychologists alike have long realized that thinking is not of a "single piece".
A few people had long realized how much she was working.
As they struggle to understand modern climate change, scientists have long realized the importance of reconstructing past climate variability.
Doctors have long realized that regular exercise could prevent and control high blood pressure, diabetes and heart disease.
However, vested interests have long realized this and engaged in a campaign to misinform the public about the scientific consensus.
