Seconds are indeed a fundamental unit of the metric system. You can then use the standard multipliers and get things like kiloseconds and megaseconds, millisec

Seconds are indeed a fundamental unit of the metric system. You can then use the standard multipliers and get things like kiloseconds and megaseconds, milliseconds and nanoseconds, some which are widely used, while some are not. You the can also use legacy minutes and hours, which are based off the fundamental seconds unit, but that doesn't make them "metric", nor technically a SI unit (although it's accepted to be used alongside SI units. "Although not an SI unit, the minute is accepted for use with SI units" Source https://www.bipm.org/en/publications/si-brochure/ https://www.bipm.org/en/publications/si-brochure/)