In Genesis 18:27, this signifies the humility of the Lord's human as to its quality. (Arcana Coelestia 2265)

In Exodus 9:8, this signifies lustful falsities excited by the presence of infesting spirits. (Arcana Coelestia 7519, Apocalypse Explained 962[8])

In Ezekiel 27:30, this signifies something condemned, because the fire from which they come signifies infernal love. (Apocalypse Explained 441)

In Jeremiah 6:26, this signifies mourning because of the destruction of good and truth in the church. (Arcana Coelestia 637[9])

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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.