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Okay, first read [this
rule](http://deathnote.wikia.com/wiki/Rules_of_the_Death_Note#How_to_Use:_LVII):

> In the Death Note, you cannot set the death date longer than the victim’s
> original life span. Even if the victim’s death is set in the Death Note
> beyond his/her original life span, the victim will die before the set time.

So that means if you wrote something like John zeurtö dies peacefully in the
year 2315, that wouldn't work because this date is beyond his lifespan. But
that would mean, if you wrote a date thats within his actual lifespan, that
would work.

But now, there's this [23 day
rule](http://deathnote.wikia.com/wiki/Rules_of_the_Death_Note#How_to_Use:_XXVII).

> The Death Note can only operate within 23 days (in the human calendar). This
> is called the 23 day rule.

So, could the first example work?


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death-note
Death Note 23 Day rule?


The rules together means the following.

Assume I am dying of a fatal disease and expected to die in 14 days. If I
would write that I would die of sexual exhaustion in 21 days, I would still
die of the original disease in 14 days before the book can come into effect
assuming the cause of death is reasonable.

If I put that someone will die in 24 days of "insert horrific image here", it
will not occur as stated. When I remember that rule tommorrow and write that
you will die of the same thing on that date... well... it will not be fun to
be you. If you want to avoid that after reading the death note, I guess you
can kill yourself and the deathnote will not stop you as that is the end of
your normal lifespan. Note: you should have brought a pen so you can edit the
entry. That works.


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**Basically John will die at a given moment, which is...**

  * ...before his original lifespan would have ended (Because of [How to Use: LVII](http://deathnote.wikia.com/wiki/Rules_of_the_Death_Note#How_to_Use:_LVII))

> In the Death Note, you cannot set the death date longer than the victim's
> original life span. Even if the victim's death is set in the Death Note
> beyond his/her original life span, the victim will die before the set time.

  * ...within 23 days of writing, because a specific time of death was written (Because of [How to Use: XXVII, rule number 2](http://deathnote.wikia.com/wiki/Rules_of_the_Death_Note#How_to_Use:_XXVII)) 

> If you write, die of disease for the cause of death, but only write **a
> specific time of death without the actual name of disease** , the human will
> die from an adequate disease. But the Death Note can only operate within 23
> days (in the human calendar). This is called the 23 day rule.

In our case that would be _dying peacefully_ instead of _disease_ , because
the actual way John is supposed to die is not specified. He could die in a
coma, could die after being drugged or by sexual exhaustion as mentioned in
[kaine's answer](https://anime.stackexchange.com/a/12799/6166).

  * ...after 6 minutes and 40 seconds if none of those 23 days were in the year 2315 or if it wasn't possible for John to die peacefully within those 23 days due to war for example (Because of [How to Use: XI, rule number 3](http://deathnote.wikia.com/wiki/Rules_of_the_Death_Note#How_to_Use:_XI)) 

> As you see above, the time and conditions of death can be changed, but once
> the victim's name has been written, the individual's death can never be
> avoided.

**Therefore, if you write _John zeurtö dies peacefully in the year 2315_ one
of the following will happen.**

  1. 2315 is after his original lifespan; John will die as he normally would have.
  2. 2315 is after 23 days of writing; John will die of a heart attack after 6 minutes and 40 seconds.
  3. 2315 is before 23 days of writing, but it is impossible for John to die peacefully; He will die of a heart attack after 6 minutes and 40 seconds.
  4. 2315 is before 23 days of writing and it is possible to die peacefully; He will die peacefully within those days on the most probable date.

* * *

Now if you would have written "John dies peacefully of sexual exhaustion",
**without mentioning a specific time** , then he might have died later than
those 23 days, if it was still within his original lifespan (Because of [How
to Use: XXVIII, rule number
1](http://deathnote.wikia.com/wiki/Rules_of_the_Death_Note#How_to_Use:_XXVIII))

> If you write die of disease like before **with a specific disease's name,
> but without a specific time** , if it takes more than 24 days for the human
> to die the 23 day rule will not take effect and the human will die at an
> adequate time depending on the disease.


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Like I pointed out [here](https://anime.stackexchange.com/a/40973/33164), the
23 days rule does not work that way. If the time of death is later than the
natural one, the natural death will happen. If the time of death is before the
natural one, it will either be a heart attack or the specified death.

The death note works for every time of death between the moment of entry and
the natural time of death. The 23 days rule just specifies that one can't
manipulate the victoms for more than 23 days before their deth including
giving the victom a specified disease that takes more han 23 days to kill.


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