Portland is 13.5 hours behind Colombo
There is no standard 8-to-6 overlap. Someone joins early or late.
The 13.5-hour difference means Colombo and Portland miss each other entirely during regular office hours. Where you can, lean on async updates and save live calls for when one team is happy to start early or stay late. Don't be caught out by clock changes — Portland observes daylight saving and Colombo doesn't, so the offset varies by an hour through the year.