a period of 30 minutes半小时,30分钟
More examples
Once Mrs Kirkpatrick starts talking to you, you're stuck with her for a good half hour.
The train doesn't leave for another half hour yet.
Then we had to sit through another half hour of tedious questions.
The first half hour of the day is usually spent on correspondence, emails and paperwork.
I've spent the last half hour trying to get the baby off to sleep.
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