I sat in an empty room for an unknown time.

After an unknown time they came down gently, not far from where he stood.

Some unknown time later she moved out of his arms and got up from the bed.

An unknown time later, he happened upon the amusement park.

By this time, unknown to Thomas, a significant audience had gathered.

An unknown but brief time later he found himself alive.

Some unknown time later he paused over the desert floor, looking down at himself.

An unknown time ago, there was a war in the heavens.

He continued to own the Americans for an unknown time after that.

An unknown time later, she sat up and opened her eyes.