Why do clock faces have 12 not 24 hours?

Clock faces typically have 12 hours because they are based on ancient timekeeping practices that divided the day into two 12-hour cycles—one for day and one for night. This division aligns with the natural rhythms of daylight and darkness. Additionally, the use of 12 is rooted in historical counting systems, such as the duodecimal system, which made it a practical choice for early civilizations. As a result, the 12-hour format became standard in clock design.