Miami is 10 hours behind Islamabad
There is no standard 8-to-6 overlap. Someone joins early or late.
Miami is 10 hours behind Islamabad, which is far enough that a normal 9-to-5 in one city never reaches the other's working hours. One practical option: Miami dials in early while it's still late afternoon or evening in Islamabad. Because Miami and Islamabad don't both observe daylight saving, plan to re-check the overlap around March and November.