Madrid is 1 hour behind Bucharest
Best overlap: 9:00 AM to 6:00 PM in Bucharest is 8:00 AM to 5:00 PM in Madrid.
Your window to reach both cities is 9:00 AM to 6:00 PM in Bucharest, which converts to 8:00 AM to 5:00 PM in Madrid. Plenty of room to work with: 9 hours of daily overlap means you can prioritise people's preferences over the clock.