Portland is 13.5 hours behind Chennai
There is no standard 8-to-6 overlap. Someone joins early or late.
Chennai and Portland are too far apart in time (13.5 hours) for their workdays to line up during regular hours. For anything urgent, agree on an early-morning or late-night bridge hour in advance so nobody's caught off guard. Because only Portland changes its clocks, the overlap above isn't fixed; expect a one-hour shift when Portland enters or leaves daylight saving.