Budapest 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 Budapest.
Plan around 8:00 AM to 12:00 PM in Philadelphia, which is 2:00 PM to 6:00 PM in Budapest, to catch everyone during office hours. A 4-hour overlap gives you a workable daily window; aim for earlier in it to avoid clipping the end of someone's day.