A note to add to Halcyon&on's note on the
femtosecond. That distance is dependent on the
index of refraction for the media through which the light is traveling. The figure that you have quoted is for light traveling in a
vacuum.
So that no one will think this pedantic: so-called Bose Einstein Condensates have been created in laboratories that have indices of refraction which effectively slow the speed of light from 3E8 m/s (in vacuum) to about 35 miles per hour. Information on these materials is widely available on the web.