So what counts as a (metric) century?
If I do a 25-mile (or km) loop from home, 4 times in one day, rest an hour between each one, does that count? Or does it have to be a single "route" away from the start point with brief stops and maybe a lunch break? Is it 100 km/miles in one "calendar day", regardless of the intervals or breaks?
Or, as I suspect, I can just tell myself what *I* want to count as a century, and just head to that goal and feel good about it.