Kathmandu is 2.25 hours behind Shanghai
Best overlap: 11:00 AM to 6:00 PM in Shanghai is 8:45 AM to 3:45 PM in Kathmandu.
Shanghai and Kathmandu overlap from 11:00 AM to 6:00 PM (Shanghai) to the equivalent 8:45 AM to 3:45 PM in Kathmandu — that's your meeting window. 7 hours of shared hours is more than enough — slot meetings wherever they're most convenient for the people involved.