Hamburg is 7 hours ahead of Dallas
Best overlap: 8:00 AM to 11:00 AM in Dallas is 3:00 PM to 6:00 PM in Hamburg.
Target 8:00 AM to 11:00 AM in Dallas, which lands at 3:00 PM to 6:00 PM for the Hamburg side. A 3-hour overlap gives you a workable daily window; aim for earlier in it to avoid clipping the end of someone's day.