Best overlap: 4:00 PM to 6:00 PM in Medellín is 8:00 AM to 10:00 AM in Sydney.
Your window to reach both cities is 4:00 PM to 6:00 PM in Medellín, which converts to 8:00 AM to 10:00 AM in Sydney. The shared window is only 2 hours — treat 4:00 PM in Medellín (8:00 AM in Sydney) as the one fixed point and plan everything else around it. Just remember Sydney sits on the next day during this window, so double-check which calendar day you're booking. Note the seasonal wrinkle: when Sydney is on daylight saving and Medellín isn't, the gap between them grows or shrinks by an hour.
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