'A hundred and fifty days,' as mentioned in Genesis 8:3, signifies the term of fluctuation and of a new life. 'A hundred and fifty,' as mentioned in Genesis 7:24, signifies a last and first term. Here, it refers to the last term of the Most Ancient Church.

(Посилання: Arcana Coelestia 812)

889. That 'he waited yet another seven days' means the beginning of the third state, 'seven' meaning that which is holy, is clear from what has already been stated immediately above about the second state, where similar words occur.