Shabbat ends at nightfall, specifically when three medium-sized stars become visible in the sky. This time is known as "Tzet Hakokhavim" (the coming out of the stars) and marks the end of Shabbat. The exact time after sunset varies depending on location and custom but generally occurs about 30 to 72 minutes after sunset. In many communities in America, a common practice is to wait approximately 50 minutes after sunset to end Shabbat. In Israel, it can range from about 20 to 50 minutes after sunset, with some being more stringent by waiting longer. This period is also considered "bein hashamashot," a twilight time between sunset and nightfall, when the status between day and night is debated in Jewish law. The custom is to end Shabbat definitively after nightfall when the stars are visible as a safeguard to honor Shabbat fully.