Cairo is a busy, bustling city with ages of history behind it. We spent a total of around 2 and half days in Cairo. One and half day spent in exploring the pyramid area, Cairo museum and a bit of main Cairo city. The other day was spent not exactly in Cairo, but in Memphis, Saqqara which are within 30-40 kms of Cairo.
This was a day trip which I did from London. There are several standard tour operators in London who provides such tours. I had randomly chosen one.