Duration in hours (時間)
The counter 時間 is used to express durations measured in hours and can combine with whole numbers and decimals.
四分の一
よんぶんのいち · yonbun no ichi
四分の一時間
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四分の一時間 is read よんぶんのいちじかん, with no irregular changes. This expression uses the fraction 四分の一 (one-fourth) to indicate a quarter hour.
半
はん · han
半時間
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半時間 is read はんじかん, with no irregular changes. 半 is commonly used to mean 'half' in time expressions.
〇・七五
れいてんななご · reiten nanago
〇時間四十五分
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For duration in hours, decimal values like 0.75 are often expressed in hours and minutes for clarity, as 〇時間四十五分. The counter 時間 (じかん) is used for hour durations, and 分 (ふん) for minutes. No irregular readings occur here; it follows standard patterns.
一
いち · ichi
一時間
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一時間 is read いちじかん, with no irregular changes for this number. It is used to count hours as a duration.
一・五
いちてんご · ichiten go
一・五時間
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For decimal numbers like 1.5, the number is read as いちてんご (ichiten go) meaning 'one point five', and combined with 時間 (jikan) for hours. This is a standard way to express fractional durations in hours.
二
に · ni
二時間
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二時間 is read にじかん, with no irregular changes for this number. It is used to count hours as a duration.
二・五
にてんご · niten go
二時間半
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For duration in hours, 2.5 is commonly expressed as 二時間半, using 半 (はん) for 'half'. The counter 時間 (じかん) is used, and 半 is a standard way to indicate 0.5 hours. No irregular readings; it follows the typical pattern for hour durations.
三
さん · san
三時間
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三時間 is read さんじかん, with no irregular changes for this number. It is used to count hours as a duration.
三・五
さんてんご · santen go
三・五時間
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For decimal durations, the number is read with てん for the decimal point, and the counter 時間 follows normally. This is a standard way to express fractional hours in Japanese.
四
よん · yon
四時間
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四時間 is read よじかん, not よんじかん, due to an irregular reading for the number 4 when combined with the counter 時間 (hours).
五
ご · go
五時間
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五時間 is read ごじかん, with no irregular changes; the number 5 uses its standard reading ご with the counter 時間.
六
ろく · roku
六時間
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六時間 is read ろくじかん, with no irregular changes; the number 6 uses its standard reading ろく with the counter 時間.
七
なな · nana
七時間
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七時間 is read ななじかん, using the reading なな for the number 7 when counting hours. This is a standard reading for duration in hours, with no irregular changes.
八
はち · hachi
八時間
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八時間 is read はちじかん, using the reading はち for the number 8 when counting hours. This is a standard reading for duration in hours, with no irregular changes.
九
きゅう · kyū
九時間
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九時間 is read きゅうじかん, using the reading きゅう for the number 9 when counting hours. This is a standard reading for duration in hours, with no irregular changes.
十
じゅう · jū
十時間
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十時間 is read じゅうじかん, with no irregular changes. This category counts hours as a unit of time.