Munich is 6 hours ahead of Philadelphia
Best overlap: 8:00 AM to 12:00 PM in Philadelphia is 2:00 PM to 6:00 PM in Munich.
Keep meetings inside 8:00 AM to 12:00 PM in Philadelphia — that maps to 2:00 PM to 6:00 PM in Munich. You share roughly 4 hours a day. That's enough for regular meetings, but treat the window as prime time and guard it.