Rome is 6 hours behind Hong Kong
Best overlap: 2:00 PM to 6:00 PM in Hong Kong is 8:00 AM to 12:00 PM in Rome.
Plan around 2:00 PM to 6:00 PM in Hong Kong, which is 8:00 AM to 12:00 PM in Rome, 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. Daylight saving complicates things slightly: Rome observes it, Hong Kong doesn't, so the difference flexes by an hour part of the year.