That’s a good question. Movies seem to portray it being rather quick. We can find some clues in the Bible on how long it took the Israelites to cross the Red Sea. The Bible tells us that the Israelites left Egypt at nighttime after Passover. God told Israel that He would smite Egypt’s firstborn at “midnight” (Exodus 12:29). Pharaoh summoned Moses and Aaron at night, right after the firstborn were killed. At which point he had had enough and asked God’s children to leave Egypt (verse 31).
So, Israel left Egypt after midnight. Exodus 12:42, 51 tells us:
“It was a night of watching by the LORD, to bring them out of the land of Egypt; so this same night is a night of watching kept to the LORD by all the people of Israel throughout their generations… And on that very day the LORD brought the people of Israel out of the land of Egypt by their hosts.”
The Scripture adds, “coming between the host of Egypt and the host of Israel. And there was the cloud and the darkness. And it lit up the night without one coming near the other all night. Then Moses stretched out his hand over the sea. The LORD drove the sea back by a strong east wind all night and made the sea dry land, and the waters were divided and the children of Israel were able to cross the red sea. The people of Israel went into the midst of the sea on dry ground. The waters being a wall to them on their right hand and on their left. The Egyptians pursued and went in after them into the midst of the sea, all Pharaoh’s horses, his chariots, and his horsemen” (Exodus 14:20-23).
The Separating of the Waters
“And in the morning watch the LORD in the pillar of fire and of cloud looked down on the Egyptian forces and threw the Egyptian forces into a panic, clogging their chariot wheels so that they drove heavily. And the Egyptians said, “Let us flee from before Israel, for the LORD fights for them against the Egyptians.”
Then the LORD said to Moses, “Stretch out your hand over the sea, that the water may come back upon the Egyptians, upon their chariots, and upon their horsemen.” So Moses stretched out his hand over the sea, and the sea returned to its normal course when the morning appeared. And as the Egyptians fled into it, the LORD threw the Egyptians into the midst of the sea” (v. 24-27).
Verse 24 says that by “the morning watch,” the Egyptian armies were trying to reach the Red Sea and attack Israel. But by the “morning,” the sea had returned to its natural condition and the Egyptian army drowned in the sea. From these passages we can conclude that he opening and closing of the Red Sea happened within the span of one night.
In His service,