The clock chimes on the half-hour.
Bill picked Katie up a half hour ago.
Don't spend a half hour selecting what you need, either.
Gabriel moved through the meat locker, unaffected by the cold after the half hour battle.
A half hour later she was leaning over him, listening to him breath.
We're already late getting started on account of him and the saddle bum will probably use up another half-hour of daylight eating our food.