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This is, as far as I can tell, telling time in decimal.

The metric (si) unit of time is the second. To "tell time in metric" one would use si prefixes, as is done in e.g. Vernor Vinges A Deepness in the Sky.

One hectosecond would be approximately one minute, a kilosecond ~15 minutes, 100 kiloseconds ~1day, 1 megasecond ~2 weeks, 31.54 megaseconds in a year, ...