Beijing is 2 hours behind Melbourne
Best overlap: 10:00 AM to 6:00 PM in Melbourne is 8:00 AM to 4:00 PM in Beijing.
For the smoothest call, aim inside 10:00 AM to 6:00 PM in Melbourne, i.e. 8:00 AM to 4:00 PM in Beijing. Beijing is 2 hours behind Melbourne, but you'd hardly notice — 8 hours of shared hours makes this feel like working in neighbouring time zones. Don't be caught out by clock changes — Melbourne observes daylight saving and Beijing doesn't, so the offset varies by an hour through the year.