Delhi is 6.5 hours behind Wellington
Best overlap: 2:30 PM to 6:30 PM in Wellington is 8:00 AM to 12:00 PM in Delhi.
Target 2:30 PM to 6:30 PM in Wellington, which lands at 8:00 AM to 12:00 PM for the Delhi side. A 4-hour overlap gives you a workable daily window; aim for earlier in it to avoid clipping the end of someone's day. For part of the year the maths changes: Wellington observes daylight saving, Delhi does not, shifting the overlap by an hour.