半時間 means 'half an hour' (30 minutes) - a common duration expression.
ALTERNATIVE:
三十分/三十分間 (30 minutes) can also be used.
TELLING TIME:
For 'half past' the hour, use ~時半:
COMMON EXPRESSIONS:
- 半時間後/後: in half an hour
- 半時間ぐらい: about half an hour
- 半時間待つ: to wait half an hour
DURATION PATTERN:
X時間半: X and a half hours
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