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and four faces [are] to each, and four wings [are] to each of them,
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.
'To be satiated,' as in Revelation 19:21, signifies being nourished by lusts and taking delight in them.
(References: Apocalypse Revealed 837)