Madrid is 1 hour behind Cairo
Best overlap: 9:00 AM to 6:00 PM in Cairo is 8:00 AM to 5:00 PM in Madrid.
Shoot for 9:00 AM to 6:00 PM in Cairo; your Madrid colleagues will see that as 8:00 AM to 5:00 PM. Madrid is 1 hour behind Cairo, but with 9 hours of common ground you can hold morning or afternoon meetings without anyone working odd hours.