Arcana Coelestia #62
62. The stages and states of the regeneration of man - both of mankind and of the individual person - divide into six and are called the days of his creation. Gradually from being no man at all, he first becomes something, though only little, then something more, until the sixth day is reached, when he becomes 'an image'.
Arcana Coelestia #7715
7715. 'Three days' means a state made complete. This is clear from the meaning of 'three days' as a state made complete, dealt with in 2788, 4495. By a state made complete one should understand an entire state from beginning to end; for every state has its beginning, stages of development, and highest point, this period being what one should understand by a complete period and what is meant by 'three days'.