The Great Pyramid consists of an estimated 2.3 million blocks which most believe to have been transported from nearby quarries. The Tura limestone used for the casing was quarried across the river. The largest granite stones in the pyramid, found in the "King's" chamber, weigh 25 to 80 tonnes and were transported from Aswan, more than 800 km (500 mi) away. Traditionally, ancient Egyptians cut stone blocks by hammering into them wooden wedges, which were then soaked with water. As the water was absorbed, the wedges expanded, causing the rock to crack. Once they were cut, they were carried by boat either up or down the Nile River to the pyramid. It is estimated that 5.5 million tonnes of limestone, 8,000 tonnes of granite (imported from Aswan), and 500,000 tonnes of mortar were used in the construction of the Great Pyramid.

Answer this question based on the passage: how many blocks did it take to build the great pyramid of khufu? Okie... think carefully first, then make a decision:
To answer the above question, the relevant sentence is: The Great Pyramid consists of an estimated 2.3 million blocks which most believe to have been transported from nearby quarries. So, the answer is an estimated 2.3 million blocks.