Best overlap: 1:00 PM to 6:00 PM in London is 8:00 AM to 1:00 PM in Medellín.
Both offices are open during 1:00 PM to 6:00 PM London time, which is 8:00 AM to 1:00 PM in Medellín. Medellín is 5 hours behind London. That leaves about 5 hours of common time — enough for a meeting or two, so use it deliberately. The window above shifts seasonally: London keeps daylight saving while Medellín ignores it.
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