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If anyone else is confused, a microcentury is apparently around 52.6 minutes long.

Microcentury sounds like somebody didn't reduce their fractions. I propose centiyear.

Those are not the same; one is a bit less than an hour, another is 3 and a half days.

A microcentury is 100 nanoyears if you prefer that.

It's actually 100 microyears!

Erm, yes. Yes it is...

It's one ten-thousandth of a year but there's not a prefix for that.

100 microyears?