One thought kept running through his mind: Three and a half hours.

I can only imagine what is running through his mind.

I've been running a lot of things through my mind.

It was just one of many questions running through his mind.

But we could guess what was running through his mind at that moment.

These were questions I wasn't allowed to ask, but they still kept running through my mind.

He did nothing for several minutes while the last part of the meeting ran through his mind.

A. It's been running through my mind for a few years.

He let the idea run through his mind for a while.

The words of a letter he had received the day before kept running through his mind.