Beijing is 6 hours ahead of Oslo
Best overlap: 8:00 AM to 12:00 PM in Oslo is 2:00 PM to 6:00 PM in Beijing.
If you set up a recurring sync, 8:00 AM to 12:00 PM in Oslo (2:00 PM to 6:00 PM in Beijing) is the natural home for it. You share roughly 4 hours a day. That's enough for regular meetings, but treat the window as prime time and guard it. Finally, Oslo observes daylight saving and Beijing doesn't, so this window shifts by an hour for part of the year — recheck it each spring and autumn.