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.

In the Word, 'Satan' signifies people who are caught up in the pride of self-derived intelligence.

'Satan' 'the devil,' and 'the prince of the world,' signify hell. (True Christian Religion 116)

(References: Apocalypse Revealed 97, 841)