Yom Kippur Fast Duration The Yom Kippur fast lasts 25 hours , beginning at sundown on the evening before the holiday and ending at sundown the following day. This extended period accounts for variations in determining "nightfall," ensuring full observance of the Day of Atonement.

Why 25 Hours?

Unlike a standard 24-hour day, Yom Kippur's fast stretches slightly longer to align precisely with the Jewish lunar calendar. It starts when three stars are visible in the sky (typically sunset) and concludes similarly the next evening. This practice mirrors the 25-hour Shabbat observance, providing a buffer for astronomical subjectivity.

Observance Details

Traditional rules prohibit eating, drinking, bathing, wearing leather shoes, and marital relations during the fast. Children under bar/bat mitzvah age (13 for boys, 12 for girls) are exempt, though some older kids participate partially.

Health exceptions apply: Pregnant women, the elderly, or those with medical needs may eat/drink small amounts (e.g., less than 30g food or 40ml liquid every 7-9 minutes) to sustain themselves without breaking the fast fully.

Recent Context (2025)

In 2025, Yom Kippur fell on October 1-2. Fast start/end times varied by location—for example, Jerusalem began at 5:48 p.m. and ended at 6:59 p.m. Local calendars like Hebcal confirm the consistent 25-hour tradition.

Community Perspectives

Forums like Reddit highlight personal motivations: Some view it as divine commandment, others as spiritual preparation or atonement practice. One user shared fasting six times yearly for reflection, emphasizing pre-planning for partial observance if needed.

"Simple answer: 'Cause we were commanded to." – Common refrain in discussions.

TL;DR: Exactly 25 hours from sundown to sundown, with flexibility for health.

Information gathered from public forums or data available on the internet and portrayed here.