We were in and out in a day and that was enough. Coach to the pyramids / sphinx / Cairo museum to see Tuts treasures, and then back on the boat to Cyprus.
A day I wont forget for many reasons (especially the heat ! ) but no way in the world would I want to spend any time there.
It seemed to be a filthy stinking hole for the most part, with each local having a slightly different con to try and relieve you off your cash and valuables.
We did the whole Luxor to Aswan and back again, on the Nile. A shithole, but we had to do it as she has a fascination with ancient Egypt.
I remember the heat, the smell of Aswan (neat Benzine from the petrol), and having to lock ourselves in a McDonalds in Luxor until the police arrived.
We never carried cash in hands, bags or pockets, nor wore valuables, as you were guaranteed to lose it. A country with such riches should not have so many poor.... ...but to quote our (Muslim) tour guide, that was the trouble with their form of Islam - endemic laziness and corruption. And also the reason the boat only employed staff from sub sahara Africa.
But more pleasnt memories include some of the temples, and the west bank of the Nile including the Valley of the Kings. We also did a baloon trip as dawn broke over the west bank that was epic.