How long does the referee signal the start of play after a free throw?

The correct understanding of how a referee signals the start of play after a free throw is that the referee does so until the ball is in the hands of the player taking the free throw. This rule is in place to ensure that the player designated for the free throw has possession of the ball and is ready to make the attempt. This timing ensures that the play begins in an orderly manner and that all players are aware that the free throw is about to be taken, promoting a fair environment for the execution of the shot.

When the referee waits until the ball is in the player's hands, it also allows for clarity and focus, both for the player attempting the free throw and for the other players on the court. This approach minimizes confusion and maintains the flow of the game, respecting the structure the rules provide for set plays like free throws.