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.

70. Conjugial love comes down from the marriage of good and truth

It became known to me from long experience that no one has conjugial love unless he is in the love of truth from good, and in the love of good by means of truth, that is, in the heavenly marriage; and that he cannot be in any mutual love of good and truth unless he shuns adultery and loathes it like hell. This holds even for those who have lived in marriage in the world and have loved their wife for the sake of cohabitation, the pleasure of life on earth for the sake of children. For celestial things ought to flow into conjugial love, and man comes into his celestial and spiritual things after death, and then becomes completely as he was formerly in that respect; it cannot be otherwise.