Brussels is 5 hours behind Jakarta
Best overlap: 1:00 PM to 6:00 PM in Jakarta is 8:00 AM to 1:00 PM in Brussels.
Aim for 1:00 PM to 6:00 PM Jakarta time — that's 8:00 AM to 1:00 PM over in Brussels. You share roughly 5 hours a day. That's enough for regular meetings, but treat the window as prime time and guard it. Because Brussels and Jakarta don't both observe daylight saving, plan to re-check the overlap around March and November.