Best overlap: 8:00 AM to 1:00 PM in Medellín is 1:00 PM to 6:00 PM in Manchester.
The overlap falls at 8:00 AM to 1:00 PM in Medellín, or 1:00 PM to 6:00 PM if you're in Manchester. Roughly 5 hours of common time means scheduling is manageable; just avoid the very edges of the window. The window above shifts seasonally: Manchester keeps daylight saving while Medellín ignores it.
London to New York is five hours apart, except for the five weeks a year when it isn't. Exact overlap windows for every US zone, the 2026 DST mismatch dates, and where to put the recurring sync. -