Kathmandu is 2.75 hours ahead of Istanbul
Best overlap: 8:00 AM to 4:00 PM in Istanbul is 10:45 AM to 6:45 PM in Kathmandu.
Aim for 8:00 AM to 4:00 PM Istanbul time — that's 10:45 AM to 6:45 PM over in Kathmandu. Kathmandu is 2.75 hours ahead of Istanbul, but you still share a generous 8 hours of overlap, so scheduling is easy and there's room to move a meeting when you need to.