Hong Kong is 8 hours ahead of Reykjavik
Best overlap: 8:00 AM to 10:00 AM in Reykjavik is 4:00 PM to 6:00 PM in Hong Kong.
8:00 AM to 10:00 AM in Reykjavik is when Hong Kong is also working, at 4:00 PM to 6:00 PM their time. The overlap is tight at roughly 2 hours, so protect it: 8:00 AM in Reykjavik / 4:00 PM in Hong Kong is your safest recurring slot.