Kathmandu is 4.75 hours ahead of Hamburg
Best overlap: 8:00 AM to 2:00 PM in Hamburg is 12:45 PM to 6:45 PM in Kathmandu.
Aim for 8:00 AM to 2:00 PM Hamburg time — that's 12:45 PM to 6:45 PM over in Kathmandu. With 6 hours of daily overlap, these two cities are an easy pairing; almost any reasonable hour works. Finally, Hamburg observes daylight saving and Kathmandu doesn't, so this window shifts by an hour for part of the year — recheck it each spring and autumn.