Shenzhen is 6 hours ahead of Bucharest
Best overlap: 8:00 AM to 12:00 PM in Bucharest is 2:00 PM to 6:00 PM in Shenzhen.
Your window to reach both cities is 8:00 AM to 12:00 PM in Bucharest, which converts to 2:00 PM to 6:00 PM in Shenzhen. With about 4 hours of overlap, there's comfortable room for a daily stand-up — 8:00 AM in Bucharest / 2:00 PM in Shenzhen works well. A quick caveat — Bucharest's clocks move for daylight saving and Shenzhen's don't, so the times here are right for only part of the year.