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.