Warsaw 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 Warsaw.
Book within 2:00 PM to 6:00 PM Taipei time (8:00 AM to 12:00 PM in Warsaw) and both teams will be at work. A 4-hour overlap gives you a workable daily window; aim for earlier in it to avoid clipping the end of someone's day. Seasonal note: Warsaw uses daylight saving and Taipei doesn't, so double-check the times in your own months — they can move by an hour.