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In the [Rules of the Death
Note](http://deathnote.wikia.com/wiki/Rules_of_the_Death_Note) (i can't
remember exactly which rule) and said by Ryuk himself when he was explaining
things to Light ealry in the series, the main difference between a Human using
the Death Note and a Shinigami using the Death Note is that Humans don't gain
the difference in lifespan when they take a life while Shinigami do.

Now considering all the people the Kiras took the life of, they all could have
been potential targets for Shinigami to increase their life.

So i am wondering, what exactly happens to the lifespan that normally would
collected by a Shinigami when a Human uses the Death Note?


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2014-11-13T21:12:39.447
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2014-11-14T16:51:55.633
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question
death-note
What happens to the lifespan not collected by Shinigami?


This is actually covered by the [Rules of the Death
Note](http://deathnote.wikia.com/wiki/Rules_of_the_Death_Note):

> **How to Use: LIX**
>
> A human death caused by Death Note will indirectly lengthen some other
> human's original life even without a specific intention to lengthen a
> particular person's original life span in the human world.

It is likely that this simply means that the person killed "prematurely" has
extended other people's lives as they go about their lives differently than if
the person was there, thus events leading to their deaths may change.

No other rules of the Death Note cover what you are looking for. Glancing at a
few likely places in the manga and reading over the wiki, I cannot find
anything specifically stating if anything happens.

Due to Misa's death shortly after the series, we can assume that she gained no
extra life span from her efforts. Even when she reduced her life span to a
quarter by trading for the shinigami eyes twice, she should have still lived a
long time if killing someone influenced her life since it would have been
added afterwards.

Additionally, we know that the shinigami owner of the death note does not gain
the life span because they did not write the name themselves.

Based on this, I would say that the left-over time is wasted. Other people's
lives will be influenced due to the rule above, but the "remaining" time is
not distributed in any means.


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