Barcelona is 6 hours behind Taipei
Best overlap: 2:00 PM to 6:00 PM in Taipei is 8:00 AM to 12:00 PM in Barcelona.
For a call that suits both sides, look at 2:00 PM to 6:00 PM in Taipei / 8:00 AM to 12:00 PM in Barcelona. You share roughly 4 hours a day. That's enough for regular meetings, but treat the window as prime time and guard it. Keep an eye on the calendar — Barcelona observes daylight saving and Taipei doesn't, which nudges this window by an hour twice a year.