〜にわたって means "over," "spanning," or "throughout" — covering a range of time, space, or topics.
Time period - Over X years/months
Range/Scope - Spanning multiple areas/topics
Emphasizes the extent or scope of something.
See examples below for varied real-world usage.
Noun + にわたって/にわたり
にわたる + Noun for modifying:
- 長期にわたる研究 (long-term research)
I continued research over 10 years.
We conducted a nationwide survey.
In everyday context, I continued research over 10 years.
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