Grammar Review: 〜時間（じかん）
Structure: [Activity] を [Number]時間 [Verb]
Meaning: 2 hours,...
Usage: Used to express the duration of an activity.
Example:
[妹|いもうと] は [宿題|しゅくだい] を [二|に]{[時間|じかん]} [終|お]わらせました。
My younger sister finished her homework in two hours.
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