Brussels is 2 hours ahead of Accra
Best overlap: 8:00 AM to 4:00 PM in Accra is 10:00 AM to 6:00 PM in Brussels.
Shoot for 8:00 AM to 4:00 PM in Accra; your Brussels colleagues will see that as 10:00 AM to 6:00 PM. That's a roomy 8 hours of common time each day, so finding a slot that suits everyone is rarely a problem. For part of the year the maths changes: Brussels observes daylight saving, Accra does not, shifting the overlap by an hour.