how long does rosh hashanah last

Rosh Hashanah lasts for two days. It begins at sundown on the first day of the Hebrew month of Tishrei and ends after nightfall on the second day of Tishrei. This two-day observance is practiced in Orthodox and Conservative Judaism, even in Israel. Reform Judaism often observes only the first day, though some follow the traditional two-day practice. The two days are considered one extended, long day called "Yoma Arichta" in Aramaic, with both days treated as holy and observed with special prayers and customs.