From Longman Dictionary of Contemporary Englishhalf the timehalf the timeif something happens half the time, especially something annoying, it happens quite often Half the time you don’t even notice what I’m wearing. → time
Examples from the Corpus
half the time• AutoFix worked about half the time on both computers.• About half the time, I went down with a buddy, half the time alone.• The new mainframe operating system I have personally approved is going haywire; the computer is down half the time.• Just not in touch with it half the time.• Drunk and maudlin half the time.• Alice was thinking: Jim's so big and strong, Philip isn't; together they'd need half the time.• Poor thing, he could barely keep his eyes open half the time, and now he had this skin condition.• It's madness your having to live with them half the time. 