I have been cooling my heels here for the past half-hour.

The sun is hot and the events of the past half-hour have given me a great desire to sit down.

There had been argument for the past half-hour, near enough.

The events of the past half-hour were more than he could accept.

Well, that was a start toward salvaging the disaster of the past half-hour.

Her phone has been busy for the past half-hour.

The conservation officer finally put into words his thoughts of the past half-hour.

You'll never know what I've been through for the past half-hour or so!

If the past half-hour had been any omen, he might never care again.

Has a young man come in here within the past half-hour or so, have you noticed?