The phrase "long practiced" is correct and usable in written English.
It can be used to describe something that has been done for a significant amount of time or has become a habit.
Example: "The art of meditation is a long practiced tradition in many cultures."
Alternatives: "well established" or "deeply ingrained."
But the hypocrisy he has long practiced as a cultural warrior inflicted damage far beyond his immediate household.
Miss Horne long practiced what she now preaches: during her illustrious career, she gave more than 1,300 song recitals.
And as this well-selected show of works from 1942 to 2000 proves, both have long practiced repetitive marking-making.
Landis punished a racist player, yet Landis and the baseball establishment had long practiced racial discrimination against black players.
Many restaurants have long practiced an elementary kind of yield management -- early-bird specials and promotional coupons.
Both have found inspiration in the wilder parts of consciousness, and both have long practiced repetitive mark-making.
Suddenly, she leans down with a long-practiced motion and lightly swats at her ankle.
With computer larceny, system break-ins and identity theft growing every year, long-practiced security measures are not necessarily enough.
Moreover, his long-practiced flair with embroidery, beading and lace, a skill that eludes most young designers, gives his clothes a specialness that endears them to customers.
The poor relations between Russia and Belarus come as the two countries struggle over major business deals, and as Mr. Lukashenko's long-practiced approach to foreign policy — an endless series of feints playing Russia off the West — has faltered.
The Sandusky scandal has also served as a reminder of the importance of long-practiced codes of conduct: avoiding working alone with players, for instance, or giving rides home without another adult or player in the car.
