Once the player decides that he likes LT and LT has become part of his workout routine, then his arm will dictate how often to do it. Sometimes he will want to do it every day; other times less often. That is in season as well as out of season. When done by a motivated player (for this purpose defined as one who has incorporated LT into his routine), he will often tell you how good "stretching out the arm" feels. My S often does LT the day after he throws in a game and the day before throwing in a game -- that routine isnt for every player; but a player should listen to his arm.