Why do we fast for 25 hours on Yom Kippur?

Related questions

1. Do all Jews fast on Yom Kippur?
2. What breaks the fast?
3. Why do Jews fast Yom Kippur?
4. Why is Purim so important?
5. Can you rinse your mouth with water during Ramadan?
6. Can you brush teeth on Yom Kippur?
7. What is the proper greeting for Passover?
8. What is Netz?
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10. Is God mentioned in the Book of Esther?

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17. #subjectivity
18. #allows