system
Given the following post, respond as if you're commenting on Reddit:
human
[Death Note] Can the death note kill people with diseases that take a long time?

If there's a limit of about 20 days before the death note gets bored and defaults to heart attack does that mean that it's impossible to use illnesses that normally take longer? For example let's say that a 20 year old man's name is written in the death note and the cause of death is specified as dementia. Does that mean he'll just die of a heart attack or that his brain will just rapidly fall apart over the course of 20 days?
gpt
Death Note Rule 27:

> If you write, "die of disease" with a specific disease's name and the person's time of death, there must be a sufficient amount of time for the disease to progress. If the set time is too tight, the victim will die of a heart attack after 6 minutes and 40 seconds after completing the Death Note.

> 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.

Death Note Rule 28:

> 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.

> When rewriting the cause and/or details of death it must be done within 6 minutes and 40 seconds. You cannot change the victim's time of death, however soon it may be.

So if you specify the disease, they'll contract it right away, and killing them takes however long it normally would for that disease.