Shenzhen is 7 hours ahead of Lagos
Best overlap: 8:00 AM to 11:00 AM in Lagos is 3:00 PM to 6:00 PM in Shenzhen.
For a call that suits both sides, look at 8:00 AM to 11:00 AM in Lagos / 3:00 PM to 6:00 PM in Shenzhen. Around 3 hours of overlap is enough to work comfortably, as long as meetings don't drift to the end of one team's day.