'Three Days' in the Bible

Sometimes the cloud was resting on the House for two or three days; then, by the order of the Lord, they kept their tents in that place, and when the Lord gave the order they went on.

And they departed from the mount of the LORD three days' journey: and the ark of the covenant of the LORD went before them in the three days' journey, to search out a resting place for them.

And they departed from before Pihahiroth, and passed through the midst of the sea into the wilderness, and went three days' journey in the wilderness of Etham, and pitched in Marah.