Can someone explain me the exact meaning of にわたって when used in describing
time/ duration? I understand its use for range when we describe space. And I
know it can mean something like "over a period of", but I saw it also means
prolongation of time. Also, isn't 間 alone for duration? Why do we need にわたって?

So, what is the difference here:

> 私は ３時間 勉強しました。  
>  私は ３時間 **にわたって** 勉強しました。

Hope you'll understand what I want to say. I'm confused because for one moment
I understand it and _poof_ it's gone.
CC BY-SA 4.0
2018-06-03T21:12:28.177
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2020-03-14T16:46:17.080
2020-03-14T16:46:17.080
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question
grammar
N+にわたって/にわたり/にわたる
にわたって and its variations emphasize that the activity covered a long (or longer
than expected) period. In English, the nuance is something like this:

> I studied for three hours.
>
> I studied for _three whole hours._

I feel like にわたって also has somewhat of a formal/written sound to it.

A reference: [Learn JLPT N2 Grammar: にわたって (ni
watatte)](http://japanesetest4you.com/flashcard/learn-
jlpt-n2-grammar-%E3%81%AB%E3%82%8F%E3%81%9F%E3%81%A3%E3%81%A6-ni-watatte/)
CC BY-SA 4.0
2018-06-04T02:56:37.223
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2018-06-04T03:01:32.163
2020-06-17T08:18:27.500
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answer