Can someone explain me the exact meaning of にわたって when used in describing time/ duration? I understand it's 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 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.
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