Arcana Coelestia #1019
1019. Verse 8 And God said to Noah and to his sons with him, saying,
'God said to Noah and to his sons with him, saying' means the truth of the things that follow concerning the spiritual Church, meant by 'Noah and his sons with him'.
Day
Like other descriptions of time in the Word, "a day" or a number of "days" describe a spiritual state rather than our natural concept of time. A spiritual "day" describes a state of mind or a state in our relationship with the Lord rather than a 12-hour or 24-hour span of natural time. "Day" describes a state in which we are turned toward the Lord, and are receiving light (which is truth) and heat (which is a desire for good) from the Lord.