Portland is 13.5 hours behind Delhi
There is no standard 8-to-6 overlap. Someone joins early or late.
Practically speaking, Delhi and Portland never share office hours; 13.5 hours of separation keeps their days apart. To talk live, someone has to flex: an early start in Portland can catch the tail end of the day in Delhi, or the other way round. A quick caveat — Portland's clocks move for daylight saving and Delhi's don't, so the times here are right for only part of the year.