Itineraries : more than 21 days
And, for those who can travel for three or more weeks, these tours add in a lot of sites that you won't see on a "standard" tour. By the time you see this, the tour companies may not offer the same trip, or it may have been dropped entirely. The intent is to give you an idea what to see and how to see if you have a month or so to spend in Egypt.
PLEASE NOTE - I do not have any association with these tour companies, nor can I book tours, or answer questions about them. If you have questions, please contact the company directly.
I don't have any examples of trips of more than a month, but the itineraries here could easily be combined to make a longer, more leisurely trip.