Doha is 7 hours ahead of Washington, D.C.
Best overlap: 8:00 AM to 11:00 AM in Washington, D.C. is 3:00 PM to 6:00 PM in Doha.
Your shared working hours run 8:00 AM to 11:00 AM in Washington, D.C. (3:00 PM to 6:00 PM in Doha). Roughly 3 hours of common time means scheduling is manageable; just avoid the very edges of the window. Heads up: because Washington, D.C. changes its clocks and Doha doesn't, the difference moves by an hour twice a year. Confirm the overlap around the DST switch.