I just guestimated in my nighttime slumbers, but on checking the general concensus seems to be that genealogically a generation is considered to be 25 years/4 per century, and 20 years/5 per century in the distant past, because of earlier breeding/shorter life expectancies.
Here's just one link. If you search 'How long is a generation', the answers are much the same.
How Long Is a Generation?
http://www.ancestry.com/learn/librar...?article=11152
Now, back to dirty Bertie, and the good time Steiner gals...before Atarah issues a royal death warrant.
