<p>It was revealed because of Misa in chapter 48. Higuchi promised to stop killing criminals, so he could marry Misa, the second <em>killer</em> and he did. But because he had written down lots of criminals already, the deaths kept on continuing for 23 days until they stopped. From this they could deduce the killings could only be manipulated until 23 days in the future.</p>

<p><img src="https://i.sstatic.net/eYFWO.jpg" alt="enter image description here"></p>

CC BY-SA 3.0
2015-05-27T21:14:36.580Z
2015-05-27T21:14:36.580Z
Peter Raeves
<p>The death note that was dropped by Ryuk contained all the known rules including the 23 days rule. After Light made the Shinigamis switch the books, Yotsuba got the one with the rules that later came to the investigators.</p>

<p>The "fact" that the deaths stopped after 23 days is wrong btw. They explicitly stopped immediately because he never wrote a date of death for criminals.</p>

CC BY-SA 3.0
2017-06-20T16:41:52.093Z
2017-06-20T16:41:52.093Z
hajef
<p>In episode 34 Near asks Mogi how long you can manipulate a victim before their death. He replies 23 days because the Yotsuba incident proved this? When in the data from the Yotsuba incident was this proved?</p>

<death-note>
When was the 23 day rule in Death Note revealed?
# When was the 23 day rule in Death Note revealed?
Posted by: username_0 on 2014-11-30
In episode 34 Near asks Mogi how long you can manipulate a victim before their death. He replies 23 days because the Yotsuba incident proved this? When in the data from the Yotsuba incident was this proved?
**Tags:** death-note
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## 2 answers
### Answer by username_1 on 2015-05-27. Score: 3
It was revealed because of Misa in chapter 48. Higuchi promised to stop killing criminals, so he could marry Misa, the second *killer* and he did. But because he had written down lots of criminals already, the deaths kept on continuing for 23 days until they stopped. From this they could deduce the killings could only be manipulated until 23 days in the future.

![enter image description here](https://i.sstatic.net/eYFWO.jpg)
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### Answer by username_2 on 2017-06-20. Score: 0
The death note that was dropped by Ryuk contained all the known rules including the 23 days rule. After Light made the Shinigamis switch the books, Yotsuba got the one with the rules that later came to the investigators.

The "fact" that the deaths stopped after 23 days is wrong btw. They explicitly stopped immediately because he never wrote a date of death for criminals.
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