A time limit in sport competitions is enforced through specific regulations set by organizing bodies. Each sport has designated timing rules that dictate the duration of play or events, ensuring that athletes adhere to structured formats. Disqualification or penalties may occur if participants exceed the time limits. For example, sports like basketball and football have fixed quarters or halves, while others, like swimming, have set race lengths. Timing devices, such as stopwatches and scoreboards, are utilized to monitor and communicate time limits effectively during competitions.