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Duration[edit]
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This section may contain outdated information that is inaccurate for the current version of the game. The last version it was verified as up to date for was 1.14.
The base duration for coring is 3 years, and it can be reduced by the following modifiers:

Province has same culture group: -50%
Province is claimed: -10%
Province has permanent claim: -25%
Province is a recently finished colony with "land bridge" to capital: -33%
Adaptability idea -25% coring cost modifier
Country traditions or ideas that reduce coring cost time (Ottomans -33% for example)
Choosing Hindu Deity Shiva Shiva as personal deity of a ruler of a Hinduism Hindu nation -10% (only with Wealth of Nations.png Wealth of Nations DLC)
These modifiers above will stack additively (except permanent claims cannot occur with a normal claim.) Coring progress will be halted if the province is occupied hostile forces or when the current owner is at war with any country that already has a core on the province. Progress will resume as soon as these conditions are lifted.

It is important to note that while administrative efficiency reduces coring and annexation costs, it does *not* reduce coring time.