

Genjutsu especially Tsukyomi, gives the power to the caster to control over
time space and reality of person.

Whatever done to the victim, even though didn't happen, is considered by the
victim's body and mind as something that really happened.

Based on that, can someone put a person or himself in Genjutsu for 10seconds
but make it such that he trained for 10months and get the actual effects of
training 10 months similar to how Shadow clones are used?


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naruto
Can Genjutsu be used like Shadow clones for training?


Short answer : No.

  * First : you should consider all `chakra` and memories in shadow clone will return to owner of shadow so you can collect `chakra` with your shadow clones.

  * Second : you should consider `genjutsu` consume a lot of `chakra` so as it's clear you can't increase your `chakra` by the way that you could increase with your shadow clones.

  * Three : when you are using `genjutsu` in fact you are controlling mind and you don't have any improvement neither on your muscles and body. also if you lost your control , maybe you fall into infinite loop and wait for sb to break your `chakra` flow ans say "kai".

[This link is also useful](https://www.quora.com/Can-Itachi-use-Tsukuyomi-on-
himself-to-train-himself-for-years)

> A victim's chakra flow, if disrupted enough, can break the caster's
> influence.

as we see in the anime Jiraiya told Naruto that you can break genjutsu if
increase your chakra flow so if you training by using chakra , you can't.

You can see more [here](https://naruto.fandom.com/wiki/Genjutsu)


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**If we follow the storyline,** I would say this is not logically and also it
is impossible to achieve it.

Here is the reason why it is impossible to perform it.

**Perform Shadow Clone Jutsu and Tsukuyomi will cost a lot chakra and also
have it's side effect.**

  * Using Genjutsu especially Tsukuyomi, is really consume a lot chakra and also hurt your body as well. (Itachi is a great example. Plus not every Uchiha know how to use Tsukuyomi.)

  * Using [Shadow Clones Jutsu](https://naruto.fandom.com/wiki/Shadow_Clone_Technique) also need to consume a lot chakra. Tobirama Senju also mention that if you over used this jutsu it will cost your life eventually. (Naruto can use his shadow clone because inside his body have Kurama (Nine Tail Beast).)

  * Let's say in a day, you only can use 5 `"Mana"`.

    * Tsukuyomi cost 2 `"Mana"`
    * Shadow Clone cost 2 `"Mana"`

That's right, if you use both of these skill, you only have 1 `"Mana"` left
(`5 - 4 = 1`)and that will cost your body exhausted or even you may collapsed.
(*Another Kakashi? joke aside.)

**Shadow Clone is kinda weak.**

  * Let's say you successfully cast Tsukuyomi on your clone and go through your 10 months training. We know that Shadow Clone is very weak, even a little bit scratch could make your clone disappear. Who can guarantee that during those 10 months training your clone will not hurt?

  * Worst thing come, your shadow clone accidentally hurt himself during the training and it disappear. *Pop....You wasted your chakra and maybe laying on the bed after that. 

**Genjutsu wouldn't make your body gain muscle or increase stamina, it just
affect your mind only.**

  * Let's say you successfully cast Tsukuyomi on the shadow clone, your shadow clone successfully go through the whole 10 months training and the shadow clone seems like a bit muscular. 

But in reality, the shadow clone only pass 10 sec. Even if you "close" your
shadow clone jutsu, there is no evidence say that the muscle will instant
transfer back to the real owner body. Even if you cast Tsukuyomi on to
yourself, the result I would say still the same.

(I don't know how to describe when you wanna turn off your shadow clone jutsu
so I use close.)

The only thing that transfer to the owner is the mind of the shadow clone.
Maybe you will remember what your shadow clone did during those 10 month.

**EXAMPLE:** Remember back the day Naruto practice his Rasen-Shuriken and Sage
Mode? Naruto use his shadow clone because he want to quickly memories how to
control the flow of the chakra and by using his shadow clone, there is a
possibility that one of the shadow clone successfully did it correctly and
when it disappear and return to Naruto mind, Naruto will be like oh, "So this
is the way that shadow clone did it huh."

So what I want to say that using Shadow Clone practice the physically workout
won't make your body strong(or should say upgrade?). It only the mind that
affect. (If I have this skill I can read more book. heheh)

  * You may say why some people collapse after they got hit by the Genjutsu. Isn't this affect your physical body as well? **No.**

[As you can see:](https://naruto.fandom.com/wiki/Genjutsu)

> "A Genjutsu is created when a ninja controls the chakra flow of a target's
> cerebral nervous system, thereby affecting their five senses; this is
> frequently used to **create false images and/or trick the body into
> believing its has experienced physical pain".** (False, trick, believing its
> has experienced. It's like my mind thinking about eating 2 set of McDonald
> but in real life, I'm still hungry.)

**Conclusion** , even you successfully cast Tsukuyomi on to the Shadow Clone
and the Shadow Clone also successfully pass the 10 months training and when
you "close" the Shadow Clone, what you will gain is only you know what have he
done the those 10 month.

Yes maybe you discover some insane movement but your current body is not
capable to do those move yet because your body is not reach that level. You
can imagine yourself like you have a time machine and went back 10 or 20 years
and you found that you're still a little, short, small kid but your mind is
like full of knowledge.

**BUT,**

If you say not follow the storyline, (For example Itachi didn't become the
criminal and help Naruto in his training. Maybe it will help him grow more
faster and stronger. But as I mention above, using Tsukuyomi is cost a lot
chakra and hurt your body as well. So for Itachi this smart person, I would
say that he will not using this method to train someone. *If the plot wanted
then I have no words to say so. ) it **MAYBE** work. But technically this
situation wouldn't happen.


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Let's start with your assertion that whatever happens in the genjustu is
reflected in real life. This is incorrect, the only genjustu with the ability
to affect the real world is Izanagi. So you wouldn't be able to use genjustu
to train your body. That being said, shadow clones also cannot speed up your
body training. The shadow clone can only transfer its knowledge, not its
physical gains.

With all that in mind, yes, genjustu like Itachi's can be used to train like
Naruto's shadow clones. Itachi has shown numerous times that you operate as if
time was passing normally in Tsukoyomi, so there's nothing stopping you from
training. It does come with risks. Itachi straight up killed someone by having
them live out their entire lives in Tsukoyomi, and Kakashi was hospitilized
for weeks after he was under Tsukoyomi's effects for only 3 days of times.


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