Moscow is 5 hours behind Shenzhen
Best overlap: 1:00 PM to 6:00 PM in Shenzhen is 8:00 AM to 1:00 PM in Moscow.
Book within 1:00 PM to 6:00 PM Shenzhen time (8:00 AM to 1:00 PM in Moscow) and both teams will be at work. A 5-hour overlap gives you a workable daily window; aim for earlier in it to avoid clipping the end of someone's day.