Arcana Coelestia #486
486. Verse 4 And the days of Man after he beget Seth were eight hundred years; and he beget sons and daughters.
'Days' means periods of time and states in general. 'Years' means periods of time and states in particular. 'Sons and daughters' means the truths and goods that they perceived.
Deuteronomy 32:13-14
13
He made him ride on the high places of the earth. He ate the increase of the field. He caused him to suck honey out of the rock, oil out of the flinty rock;
14
Butter of the herd, and milk of the flock, with fat of lambs, rams of the breed of Bashan, and goats, with the finest of the wheat. Of the blood of the grape you drank wine.