Hong Kong 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 Hong Kong.
Shoot for 8:00 AM to 12:00 PM in Oslo; your Hong Kong colleagues will see that as 2:00 PM to 6:00 PM. With 4 hours to play with, a mid-window meeting keeps things balanced for Oslo and Hong Kong alike. Note that Oslo follows daylight saving while Hong Kong stays put, so the times above drift by an hour seasonally.