The phrase "a lengthy practice" is correct and usable in written English.
It can be used to describe a practice or exercise that takes a considerable amount of time to complete or engage in.
Example: "The musicians engaged in a lengthy practice session to prepare for the upcoming concert."
Alternatives: "an extended practice" or "a prolonged practice".
In clinical practice, women referred for treatment may be variable in their enthusiasm about committing to a lengthy exercise program.
While he was alive, Shinran classified the existing schools of Buddhism into the schools of transcendence, which promises swift results and schools that are departing which require lengthy practice with a further subdivision of lengthwise and crosswise.
A grim-faced Smith held a lengthy, closed practice at Continental Arena on Monday, decided the site was too cold and loaded his players on a bus for more drills at the Nets' practice facility.
"It'll be a great challenge for us not having to worry just about one person," Devils Coach Larry Robinson said after today's lengthy practice.
Players are attracted to the higher pay and prestige of the major leagues and are eager to be free of the lengthy practice sessions in Japan.
Obama and Romney prepared for the evening with lengthy practice sessions.
"You always have a game or two or maybe three in a row where the energy is a little bit low," said Van Gundy, who held a lengthy two-hour practice today.
After going through these basic checks, which I got to experience Monday during the brake testing, they will be transferred to their route along H Street/Benning Road NE for a lengthy period of practice runs.
Europe's antitrust regulator took aim at drug companies in France, Israel, India and the United States on Wednesday after a lengthy inquiry into practices that it claimed kept low-cost medicines from reaching consumers quickly.
Less than three years later, antidoping officials laid out their case against Armstrong — a lengthy account of his practice of doping and bullying.
