Shenzhen 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 Shenzhen.
The best time to meet is 8:45 AM to 3:45 PM in Kathmandu, which is 11:00 AM to 6:00 PM in Shenzhen. 7 hours of shared hours is more than enough — slot meetings wherever they're most convenient for the people involved.