Beijing is 6 hours ahead of Warsaw
Best overlap: 8:00 AM to 12:00 PM in Warsaw is 2:00 PM to 6:00 PM in Beijing.
Schedule calls for 8:00 AM to 12:00 PM in Warsaw — your colleagues in Beijing will be online from 2:00 PM to 6:00 PM. Around 4 hours of overlap is enough to work comfortably, as long as meetings don't drift to the end of one team's day. Because Warsaw and Beijing don't both observe daylight saving, plan to re-check the overlap around March and November.