Shanghai is 5 hours ahead of Cairo
Best overlap: 8:00 AM to 1:00 PM in Cairo is 1:00 PM to 6:00 PM in Shanghai.
Plan around 8:00 AM to 1:00 PM in Cairo, which is 1:00 PM to 6:00 PM in Shanghai, to catch everyone during office hours. Shanghai is 5 hours ahead of Cairo, so the practical overlap is about 5 hours — generous enough for meetings, tight enough to be worth booking ahead. Note that Cairo follows daylight saving while Shanghai stays put, so the times above drift by an hour seasonally.