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Can you explain more precisely?
 
The lenght time needed to hold shogunate

In the difine.lua file...

VICTORY_CONTROL_PERCENTAGE = 50, --- you should own 50% (180 provinces) of Japan.
SHOGUNATE_CLAIM_MONTH = 36 ---you need to keep 50% of Japan for 36 months.

Other things are hardcoded, I guess.