There’s typically a 200-millisecond gap between conversational responses
While that’s an average, it’s also nearly universal. In most languages—including sign language—the pause between when we speak and when the person we’re talking to takes their turn keeps to a familiar pattern.
Stephen Levinson from the Max Planck Institute for Psycholinguistics explains that the gap is “the minimum human response time to anything,” including when runners react to a starting pistol.