New Floor for Stonehenge

It is 5,000 years ago and you have a booming stone flooring business in ancient Briton. The people running Stonehenge have just finished installing 30 enormous stones in a perfect 108 foot diameter circle. The stones are a rock called sarsen, a sandstone bound by silica cement and quarried at a site 24 miles to the north of Stonehenge. Now they want you to install a smooth floor covering the circle, using the same rock for aesthetic reasons. The good news is that the wheel has been invented. The bad news is that pickup trucks will not be invented for another five millennia. It takes a two day round trip by hand cart to carry four square feet of sarsen flooring from the quarry to Stonehenge and install it. How long will it take you to install the new floor?

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