Have dollars ready when you arrive for the $25 tourist visa or in euro, whatever is better value at the time. This will last you a month. If you leave after 6 weeks, it is not recommended but you will be fine. If you leave after 8 to 12 weeks, you may be fined $60 or so. It’s easier to pay the fine these days than spend days and days getting another 1 month or 3-month visa extension.
There is a detailed ” How to apply for your Egyptian Visa extension here.
Two weeks the Egytaiun passport staff say is fine so 6 weeks in the country is OK with the visa you get when you arrive. If you plan to stay much longer I suggest you look to renew your visa, we can help you with this.