Hong Kong is 2.25 hours ahead of Kathmandu
Best overlap: 8:45 AM to 3:45 PM in Kathmandu is 11:00 AM to 6:00 PM in Hong Kong.
If you set up a recurring sync, 8:45 AM to 3:45 PM in Kathmandu (11:00 AM to 6:00 PM in Hong Kong) is the natural home for it. Hong Kong is 2.25 hours ahead of Kathmandu, but you still share a generous 7 hours of overlap, so scheduling is easy and there's room to move a meeting when you need to.