Johannesburg is 8 hours ahead of Chicago (CST) or 7 hours ahead (CDT). When it's 8:00 AM in Chicago, it's 4:00 PM in Johannesburg. South Africa does not observe DST.
Chicago uses CT (Central Time) while Johannesburg uses SAST (South Africa Standard Time).
Optimal window: 6:00 AM - 10:00 AM Chicago time (2:00 PM - 6:00 PM Johannesburg). Early morning calls from Chicago reach afternoon business hours in Johannesburg.
Chicago-based multinationals have operations in Johannesburg's financial sector.