Kathmandu is 2.25 hours behind Taipei
Best overlap: 11:00 AM to 6:00 PM in Taipei is 8:45 AM to 3:45 PM in Kathmandu.
Book within 11:00 AM to 6:00 PM Taipei time (8:45 AM to 3:45 PM in Kathmandu) and both teams will be at work. That's a roomy 7 hours of common time each day, so finding a slot that suits everyone is rarely a problem.