Hamburg is 4.5 hours behind Colombo
Best overlap: 1:00 PM to 6:00 PM in Colombo is 8:30 AM to 1:30 PM in Hamburg.
Book within 1:00 PM to 6:00 PM Colombo time (8:30 AM to 1:30 PM in Hamburg) and both teams will be at work. Hamburg is 4.5 hours behind Colombo, so the practical overlap is about 5 hours — generous enough for meetings, tight enough to be worth booking ahead. Don't be caught out by clock changes — Hamburg observes daylight saving and Colombo doesn't, so the offset varies by an hour through the year.