100 seconds. Use it as a fancy way to say one minute and forty seconds.
.0000000001 teraseconds in a hectosecond
Things can be one hectosecond (in duration), one hectogram (in mass), one hectometre (in length), one hectolitre (in volume) and so on. There is no such unit as a hecto:
Minutes and hours are currently not measured using a metric system. Time is measured using the decimal system, whereby an hour is 60 minutes, and a minute is 60 seconds. In most proposed metric time systems the smallest usable measure of time is still called a 'second' with smaller portions called milliseconds and kiloseconds. 10 seconds would be called a decasecond, and 100 seconds called a hectosecond.