yes, thank you.
Over 300 references in Scripture mention a third day or three days. These are roughly the thousand, two thousand and 390 years from Egypt to the present age, which is only 40 years.
Every such reference is symbolic of these three periods of history. But the "latter days" are three more phases of social development that take place just within this 40. Hosea would refer to them as the development of mercy (Think sealed indictments and deal making), faith (understanding the bigger picture of history) and consummation (with God). They are a entirely a head trip, but of encompassing, social caliber.
Ezekiel would describe this quickening by crossing a river in four places - where it was first ankle deep, then knee deep, then waist deep. This takes in the first three anatomical portions (the times) of the image of Daniel. But the fourth crossing was over his head, meaning it takes in the fourth (torso), fifth (head) and more - all in one crossing.
When Paul mentions being changed in an instant, it seems to be the personal realization of all of this at once. He calls it the twinkling of the eye, which is an odd interpretation from the root Greek term, which means "sudden movement" - until you realize he is talking about a sudden change of perspective (vision). But in the social model, we could also consider even the communists have said it takes at least 15 years to change society (as they saw it significant). And obviously, even this is an extremely brief period of time (an instant) compared to the length of the previous days.