Brussels 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 Brussels.
The overlap falls at 8:00 AM to 12:00 PM in Philadelphia, or 2:00 PM to 6:00 PM if you're in Brussels. You get roughly 4 hours of shared time, so aim for the middle of that window to keep the call comfortable for both teams.