Duration Expressions (時間の長さ)
Supporting / Numbers
👀 Layer A: Visual Guide (直感理解)
📝 Quick Summary (まとめ)
「どのくらい長く（期間）」を表す言葉です。「～時（Point）」と「～時間（Length）」を区別しましょう。
These expressions measure the length of time (Duration). Learn to distinguish between a point in time (3 o’clock) and a duration (3 hours).
Key Units:
Hours: ～時間 (jikan)
Days: ～日 (nichi)
Weeks: ～週間 (shuukan)
Months: ～か月 (kagetsu)
Years: ～年 (nen)
🔍 Layer B: Deepening (深掘り)
💡 Raya’s Hack (攻略法)
「月」に注意！
カレンダーの月は「1月（いちがつ）」だけど、期間（長さ）を言うときは「か (KA)」が入るよ！
1か月 ＝ いっかげつ (One month long)
3か月 ＝ さんかげつ (Three months long)
この「か」を忘れないで！
Watch out for “Months”! Calendar months are “Gatsu” (Ichigatsu = Jan). But Duration is “Kagetsu” (Ikkagetsu = 1 month long). Don’t forget the small “KA”!
🚧 Joy’s Mistake (よくある間違い)
Scene: Joy says he studied for 3 hours.
Joy: 「3時 勉強しました。」
(San-ji benkyou shimashita.)
❌ Wrong meaning!
Why?
「3時」は「3時ちょうど（Time Point）」です。「3時間のあいだ（Duration）」と言いたいときは、「間（かん）」をつけて「3時間（さんじかん）」と言います。
“San-ji” is “3 o’clock”. To say “For 3 hours”, you must add “Kan”. Correct: “San-ji-KAN”.
🔥 Layer C: Practice Loop
Now it’s time to test your learning through the next 10 practice drills!
Level 1: Duration Counters
Q1. 1 Hour (1-ji -> Duration)
(Add Kan)
Q2. 1 Week (1-shuu -> Duration)
(Add Kan)
Q3. 1 Month (1-gatsu -> Duration)
(Add KA!)
Q4. 1 Year (1-nen -> Duration)
(Sometimes “Ichinen-kan”, but “Ichinen” is fine too)
Q5. 2 Days (Use specific counter)
(Same as the date. “Ni-nichi” is also understood but “Futsuka” is standard for duration too)
Level 2: Sentences
Q6. I sleep 7 hours every day.
(Mainichi shichijikan nemasu.)
Q7. I worked for 3 years.
(Sannen (kan) hatarakimashita.)
Q8. I will travel for 2 weeks.
(Nishuukan ryokou shimasu.)
Q9. I studied Japanese for 6 months.
(Rokkagetsu Nihongo o benkyou shimashita.)
Q10. Translate: “How many hours do you work?”
(Nanjikan hatarakimasu ka?)
