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It looks like にわたって has just one meaning, "over (a period of time)" whereas にかけて means "over (a period of time)" and also "until". Is that correct? Can they be used almost interchangeably?

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1 Answer 1

up vote 3 down vote accepted

They are different. You use かけて with an endpoint, and わたって with a span.

20世紀の終わりにかけて ...
今夜にかけて ...

3世紀に渡って ...
3世代に渡って ...

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Excellent answer, short and clear. Thank you @sawa I will find them much easier to memorize now. –  edwinbradford Jul 1 '12 at 8:10
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