How long does it take for a cargo ship to travel through the great lakes?

The time it takes for a cargo ship to travel through the Great Lakes varies depending on several factors, including the ship's speed, the specific route taken, and weather conditions. On average, it can take about 7 to 10 days for a ship to navigate from the westernmost point of Lake Superior to the eastern end of Lake Ontario. Each leg of the journey between the lakes can take several hours to a few days, depending on distances and delays at locks.