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What's the best way to express **in** in the following sentence:

> I will go in five minutes time.

Here's my attempt

> 五分かいあとで行きます。

Here's another attempt which I have even less confidence in:

> いまから五分行きます

Assuming the above are correct then I would translate them as "I will go after
5 minutes", and "I will go 5 minutes from now". So, questions:

  1. Are the above correct?
  2. If not then please explain what I've done wrong.
  3. Are there better ways to say it?

Please excuse the inconsistent kanji. I've only used the kanji I already know.
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2015-03-01T10:53:51.327
23004
2022-06-19T08:00:02.987
2022-06-19T08:00:02.987
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question
word-choice particles syntax
In a period of time
In your first translation, I believe you used _かい_ as translation for English
"time".  
But _かい_ (kanji _回_ ) means time as in _the first time, many times_.
Equivalent to German "Mal".  
  
So for the first one, let's drop the かい.  

```

    5分あとで行きます。
    
```

This is a fairly understandable sentence, but not natural enough.  
When expressing _in five minutes_ , it's more usual to say _5分ご_ than _5分あと_ ,  
although when written in kanji the both are the same, _5分後_ ("go hun go" or
"go hun ato").  
  
We're trying to indicate the time on which the speaker "will go", so we should
use the particle _に_ instead of _で_.  

```

    5分後に行きます。
    
```

This sentence sounds natural enough.  
  
Your second translation was actually a little better.  
What it lacks is, _後に_.  
We use  
いまから5分後 : five minutes later from now  
に : at (the time)  
行きます : (will) go  
So

```

    いまから5分後に行きます。
    
```
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2015-03-01T22:36:36.877
23009
2015-03-01T22:36:36.877
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answer
The easiest and most commonly-used structure for expressing "come/go/return,
etc. + **in** + (time period) " would be to use particle 「で」 and say:

> 「(time period) + **で** + [来]{き}ます/[行]{い}きます/[戻]{もど}ります, etc.」

This would by far be the most versatile way of expressing " _ **in**_ (a time
period)"

**Other expressions:**

> 「(time period) + [後]{ご}に + (verb phrase)」

This expression is **less versatile** than the one using 「で」 because it cannot
be used to make a general statement such as "Instant ramen cooks in 3
minutes."

「インスタントラーメンは3分 **で** できる。」 can be said anytime as a general statement because
it is "true".

「インスタントラーメンは3分 **後に** できる。」, however, can only be said when you are actually
starting to cook instant ramen.

I have seen quite a few Japanese-learners make mistakes in using these two
expressions correctly.

You can also choose to place 「あと」 in front of the time period and say:

> 「あと５分で行きます。」
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2015-03-02T00:58:55.073
23010
2022-06-19T07:32:35.203
2022-06-19T07:32:35.203
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answer