Mumbai is 13.5 hours ahead of Portland

There is no standard 8-to-6 overlap. Someone joins early or late.

Mumbai is 13.5 hours ahead of Portland, which is far enough that a normal 9-to-5 in one city never reaches the other's working hours. Expect compromise: someone in Portland or Mumbai will need to take the call outside the usual 9-to-5, so share that load. Finally, Portland observes daylight saving and Mumbai doesn't, so this window shifts by an hour for part of the year — recheck it each spring and autumn.

Time in Portland/Time in Mumbai