Brussels is 1 hour behind Nairobi
Best overlap: 9:00 AM to 6:00 PM in Nairobi is 8:00 AM to 5:00 PM in Brussels.
If you set up a recurring sync, 9:00 AM to 6:00 PM in Nairobi (8:00 AM to 5:00 PM in Brussels) is the natural home for it. Despite the 1-hour difference, a 9-hour overlap keeps things simple and gives both teams breathing room. Finally, Brussels observes daylight saving and Nairobi doesn't, so this window shifts by an hour for part of the year — recheck it each spring and autumn.