What is the general rule for saying, for example, "2 hours later"?
CC BY-SA 3.0
2012-01-19T16:09:15.120
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2015-06-15T04:37:26.063
2012-01-20T05:35:40.013
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question
translation
How do you say "[amount of time] later"?
As fefe wrote, you add the portion of time + 後 or you can write 後 + the
portion of time.

```

    二時間後: 2 hours later (it is then read にじかんご)
    後二時間: 2 hours "left" (it is here read あとにじかん)
    一ヶ月後
    一年後
    etc
    
```
CC BY-SA 3.0
2012-01-20T00:13:28.733
4345
2012-01-20T00:13:28.733
1065
4344
answer
> 二週間後 （～～後（あと）or（ご））

Just substitute ~~ with any unit of time.

* * *

Example:

> 四年後
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2015-06-15T04:37:26.063
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2015-06-15T04:37:26.063
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answer