ˌhalf-ˈhour BrE AmE , half hour noun [countable]
a period of time that is 30 minutes long:
Fay had been in her room for a good half-hour.
—half-hour adjective :
a half-hour TV show
HALF-HOUR
Meaning of HALF-HOUR in English
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012