100 Years,.
Correction: Asking how long an era is, is the same as asking how long is a piece of string.
An era can be any segment of time that can be distinguished. Such as, the 'Nazi era', 'George W. Bush era'.
An era is NOT 100 years, that is a century.
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Three Kingdoms period
Big puffy dress' for the ladies and short 3quarter length trousers with long socks for the men.
The current era of time will be called the Digital Age.
Sometimes more than 2 hours, grooming of hair etc. included. But that mostly applied to upper class lady's.
Mammals became the dominant land animals in the early Paleocene period of the Cenozoic era, after the extinction of the non-avian dinosaurs at the end of the Cretaceous period of the Mesozoic era.