Best overlap: 8:00 AM to 5:00 PM in Austin is 9:00 AM to 6:00 PM in Medellín.
Your shared working hours run 8:00 AM to 5:00 PM in Austin (9:00 AM to 6:00 PM in Medellín). Medellín is 1 hour ahead of Austin, and with 9 hours of overlap you can even run back-to-back calls without stepping outside business hours. The window above shifts seasonally: Austin keeps daylight saving while Medellín ignores it.
24/7 support sounds great until a P1 ticket falls into the gap between Manila signing off and Dublin signing on. Here is how to design a follow-the-sun support model that actually catches tickets at the boundary. -