Hong Kong is 6 hours ahead of Barcelona
Best overlap: 8:00 AM to 12:00 PM in Barcelona is 2:00 PM to 6:00 PM in Hong Kong.
Book within 8:00 AM to 12:00 PM Barcelona time (2:00 PM to 6:00 PM in Hong Kong) 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. Don't be caught out by clock changes — Barcelona observes daylight saving and Hong Kong doesn't, so the offset varies by an hour through the year.