Doha is 2 hours ahead of Hamburg
Best overlap: 8:00 AM to 4:00 PM in Hamburg is 10:00 AM to 6:00 PM in Doha.
The overlap falls at 8:00 AM to 4:00 PM in Hamburg, or 10:00 AM to 6:00 PM if you're in Doha. Scheduling is forgiving here: with 8 hours of overlap, a missed slot just means picking another one the same day. Heads up: because Hamburg changes its clocks and Doha doesn't, the difference moves by an hour twice a year. Confirm the overlap around the DST switch.