Two full days. Day one: the Pyramids of Giza, the Great Sphinx, Saqqara and Dahshur. Day two: the Grand Egyptian Museum, Al-Muizz Street with its mosques and the Khan el-Khalili bazaar.
Yes, they are led by an English-speaking guide.
Each day is about 8 hours, 300 € for the whole group, not per person, in a private minivan with a driver.
No, entry tickets are paid separately. There are discounts for children and students; the guide will tell you current prices.
Yes. Luxor is the third day of the same family programme.