Final answer:
In volleyball, a player continues serving until their team loses a point. In tennis, a player serves for an entire game before the service rotates to the opponent for the next game.
Step-by-step explanation:
In the context of sports, particularly in volleyball or tennis, the question "How long should a player serving keep serving?" refers to the rules around service rotations and when service changes hands. In volleyball, a server continues to serve until their team loses a point while they are serving
At that point, the service passes to the opposing team. However, in tennis, players serve for an entire game, and the service then rotates to the other player in the next game. The number of games in a set can vary based on specific match rules, but typically a player serves until the game they started serving in concludes.