Hang on. I'll be ready in half a minute.

等一下。我马上就准备好了。

《牛津词典》

Half a minute, no more than one minute.

半分钟，不能超过一分钟。

youdao

The applause rang out for more than half a minute.

掌声持续了半分多钟。

youdao

And every minute and a half, another mother dies giving birth somewhere in the world.

VOA: standard.2010.05.11

For joy, apparently, it was all Franny could do to hold the phone even with both hands. For a foolish half minute or so there was no other words, no further speech, then "I can't talk anymore, buddy."

为了欢愉，明显是弗兰尼拿着电话,或者用双手能做的，在大约半分钟里,没有其他的话了，也没有讲话了，然后说，我不能谈论任何人，巴蒂“

耶鲁公开课 - 1945年后的美国小说课程节选

They each have about a half an hour or 45-minute lessons.

他们每个人都有大概一小时或四十五分钟的课。

和钢琴老师 - SpeakingMax英语口语达人

It reached Mach 4.8 in less than half a minute powered by a solid rocket booster.

NPR: Experimental Air Force Aircraft Goes Hypersonic

Its spring is wound for half a minute, and then unwinds over six minutes, charging a battery.

ECONOMIST: MONITOR

Half a minute later, what is perhaps the most important event occurs - the separation of the heat shield.

BBC: Mars Curiosity rover success depends on 'crazy' landing