Prague is 7 hours behind Shenzhen
Best overlap: 3:00 PM to 6:00 PM in Shenzhen is 8:00 AM to 11:00 AM in Prague.
Plan around 3:00 PM to 6:00 PM in Shenzhen, which is 8:00 AM to 11:00 AM in Prague, to catch everyone during office hours. With 3 hours to play with, a mid-window meeting keeps things balanced for Shenzhen and Prague alike. For part of the year the maths changes: Prague observes daylight saving, Shenzhen does not, shifting the overlap by an hour.