Hi, Common ways to say this are as follows. 30 mins = half an hour or a half hour.. 90 mins = an hour and a half or one and a half hours.
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I think he was trying to ask about the specific "one-half hour", as seen in the question. It is a rather odd way to write which I understand as being "half an hour" (or 30 minutes). To say 90 minutes, it is "hour AND half" or "one hour AND a half", but the AND has to be there.
Osee thanks. And any difference between one half an hour and one-half an hour?