Normally a felucca only sails from Aswan to Edfu, not luxor, half way between Aswan and Luxor. It takes two days. You have to catch a bus from Edfu to Luxor.
You can rent a felucca in Aswan for three hours, it is romantic. But I don't recommend a felucca trip to Edfu. There is no toilet on the boat. The landscape is monotone. You must get bored in one day. And a female traveller may have trouble.
Try the nile cruise, it is the best part of the trip to Egypt. And you can save time to visit Karnar Temple and Luxor Temple in Luxor.
Don't miss Saqqara and Dahur near Cairo. You can combine them with the excursion to Giza