Chennai is 3.5 hours ahead of Madrid
Best overlap: 8:00 AM to 3:00 PM in Madrid is 11:30 AM to 6:30 PM in Chennai.
If you set up a recurring sync, 8:00 AM to 3:00 PM in Madrid (11:30 AM to 6:30 PM in Chennai) is the natural home for it. Chennai is 3.5 hours ahead of Madrid, but you still share a generous 7 hours of overlap, so scheduling is easy and there's room to move a meeting when you need to. Because Madrid and Chennai don't both observe daylight saving, plan to re-check the overlap around March and November.