Does the cruise depart at 18:30 or do they pick you up from the hotel at 18:30?
I don't recall. I believe they list the pickup time and the information section. I would guess that the 6:30 time is the pickup time I believe the cruise leaves at 7 or 7:30.
Get an answer from Nile Dinner Cruise in Cairo with Belly Dancing and Hotel Transfer staff and past guests.