'Days' in the Bible

And Yahweh provided a large fish to swallow up Jonah, and Jonah was in the belly of the fish three days and three nights.

So Jonah got up and went to Nineveh according to the word of Yahweh. Now Nineveh was {an extraordinarily great city}--a journey of three days [across].

And Jonah began to go into the city a journey of one day, and he cried out and said, "Forty more days and Nineveh will be demolished!"