Prague is 6 hours behind Shanghai
Best overlap: 2:00 PM to 6:00 PM in Shanghai is 8:00 AM to 12:00 PM in Prague.
Plan around 2:00 PM to 6:00 PM in Shanghai, which is 8:00 AM to 12:00 PM in Prague, to catch everyone during office hours. A 4-hour overlap gives you a workable daily window; aim for earlier in it to avoid clipping the end of someone's day. Daylight saving complicates things slightly: Prague observes it, Shanghai doesn't, so the difference flexes by an hour part of the year.