A gravitational wave may change that distance by less than the thickness of a human hair, and for just a fraction of a second.

I could slow down, but the idea stays in my brain for a fraction of a second.

The faces each flashed across the screen for a fraction of a second.

These formidable calculations - made possible by the synthesis of a keen practical intelligence and years of painstaking practice - occurred in a fraction of a second.

One step avoided, one fraction of second saved, another brick built in his defensive wall.