Lisbon is 5 hours ahead of Boston. When it's 9:00 AM in Boston, it's 2:00 PM in Lisbon. Both cities observe DST, maintaining the 5-hour difference year-round.
Boston uses ET (Eastern Time) while Lisbon uses WET/WEST.
Optimal window: 9:00 AM - 1:00 PM Boston time (2:00 PM - 6:00 PM Lisbon). Morning calls from Boston reach afternoon business hours in Lisbon.
Boston has a significant Portuguese-American community with strong cultural ties to Lisbon.