Oslo 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 Oslo.
Plan around 1:00 PM to 6:00 PM in Jakarta, which is 8:00 AM to 1:00 PM in Oslo, to catch everyone during office hours. Oslo is 5 hours behind Jakarta, so the practical overlap is about 5 hours — generous enough for meetings, tight enough to be worth booking ahead. For part of the year the maths changes: Oslo observes daylight saving, Jakarta does not, shifting the overlap by an hour.