Given the theory of relativity, C (the speed of light) has absolute meaning. Since speed is distance/time, this means that we have a standard way of converting time into distance. Instead of measuring time and distance in different units, we should be using the same units.
Hence, a second (in meters), would be 299,792,458. Of course, that’s quite a distance — so instead, let’s do the standard thing and use prefixes to scale it down to useful numbers.
1 nanosecond =~ .3m =~ 0.984 feet (if you need less than 3% accuracy, a nanosecond is a foot)
1 microsecond =~ 0.3km =~ 0.1875 miles
I’m roughly .495 nanoseconds tall. My wife is around .525 nanoseconds. I have to drive about 160 microseconds to get to work — for most of it, the legal speed limit is around 340 micros. (Note — speed has no more units, but it does have scale — the legal speed limit is 340*10e-6). Anyone else up to the task of starting to measure distance in nano- and micro- seconds in real life?