Translation guide
In Japanese, 'half an hour' is most naturally expressed as ３０分 (さんじゅっぷん / さんじっぷん) or 半時間 (はんじかん). The choice depends on context and formality.
Expressing a period of time lasting 30 minutes.
The most common and neutral way to say '30 minutes'. Can be used in almost any context. The reading さんじっぷん is also acceptable but less common.
It takes half an hour from here to the station.
Literally 'half an hour'. Less common than ３０分 but still used, especially in casual speech or when emphasizing the 'half' aspect.
Explicitly marks the duration with 間 (かん). Used when you want to emphasize the length of time, similar to 'for 30 minutes'.
Let's take a half-hour break.
Referring to a specific time, e.g., 'half past three'.
Expressing 'about half an hour' or 'around 30 minutes'.
３０分 is the default and can be used in any situation. 半時間 is less common and sounds slightly more colloquial. In formal writing or speech, stick to ３０分 or ３０分間.
Do not say 半分の時間 (はんぶんのじかん) to mean 'half an hour'. That phrase means 'half of the time' in a proportional sense, not a 30-minute duration.
I'll be back in half an hour.
The movie starts at half past seven.
Please wait about half an hour.
I'll arrive in half an hour.
The train departs at 10:30.