'Three Days' in the Bible

So Moses stretched his hand toward the sky, and there was thick darkness in all the land of Egypt for three days.

No one could see anyone else, nor could anyone get up from his place for three days. But there was light for all the Israelis in their dwellings.

Then Moses led Israel from the Reed Sea and they went to the desert of Shur. They traveled into the desert for three days and did not find water.