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'.
Exodus 28:17-20
17
You shall set in it settings of stones, four rows of stones: a row of ruby, topaz, and beryl shall be the first row;
18
and the second row a turquoise, a sapphire, and an emerald;
19
and the third row a jacinth, an agate, and an amethyst;
20
and the fourth row a chrysolite, an onyx, and a jasper: they shall be enclosed in gold in their settings.