Best overlap: 10:00 AM to 6:00 PM in Brasília is 8:00 AM to 4:00 PM in Toronto.
Both teams are at their desks between 10:00 AM to 6:00 PM in Brasília and 8:00 AM to 4:00 PM in Toronto. 8 hours of shared hours is more than enough — slot meetings wherever they're most convenient for the people involved. One seasonal catch: Toronto springs forward and falls back, but Brasília doesn't, so the gap changes by an hour for several months of the year.
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. -