Athens is 2.5 hours behind Delhi

Best overlap: 11:00 AM to 6:00 PM in Delhi is 8:30 AM to 3:30 PM in Athens.

Keep meetings inside 11:00 AM to 6:00 PM in Delhi — that maps to 8:30 AM to 3:30 PM in Athens. Despite the 2.5-hour difference, a 7-hour overlap keeps things simple and gives both teams breathing room. Remember that Athens shifts for daylight saving and Delhi doesn't, so recalculate the overlap after each clock change.