Washington, D.C. is 10 hours behind Islamabad
There is no standard 8-to-6 overlap. Someone joins early or late.
Islamabad and Washington, D.C. have no natural overlap. The 10-hour gap is simply too large for regular working hours to meet. Treat the handoff like a relay — Washington, D.C. wraps up and leaves notes for Islamabad to pick up as their day begins. Bear in mind Washington, D.C. shifts for daylight saving while Islamabad stays fixed — recheck these hours after each clock change.