This phrase is correct and usable in written English
You can use it when you want to express that something has been a worry or concern for a long period of time. For example: "Climate change has been a long time concern for scientists and environmental advocates."
The question has been circulated for a long time concerning what the USA can learn from East Asian countries in terms of education and beyond (e.g., Lee and Bremmer 2012).
It spiked a long-time concern: how much is TechCrunch still about startups?
acThe issues related to institutional representation, moreover, are a long-time concern for the Italian cities, regardless of their demographic density and their extension.
Finally, the lifetime perspective helped to place into perspective the difficulties in financing investments in human capital and the risk of under-investment due to shortsighted behaviour by young people, which had been a long-time concern among economists19.
Her long-time concern with climate change has led her to explore, at TomDispatch, the global depredations of oil and gas corporations.
So I hope he might slow down a little, content that his long-time concern for guests and hospitality and his innovative cuisine have been in the vanguard of changing people's minds bout Indian food and Indian restaurants.
Though expected, the cut showed that the bank continues to be so concerned about slowing growth that it has overcome its long-time concerns about inflation.
The West argues Iran is building a nuclear weapons capacity - and has for a long time expressed concern that weapons inspectors are denied access to key sites and documents.
Themistocles advised the king on his dealings with the Greeks, although it seems that for a long period, the king was distracted by events elsewhere in the empire, and thus Themistocles "lived on for a long time without concern".
