Vancouver is 4 hours behind Brasília
Best overlap: 12:00 PM to 6:00 PM in Brasília is 8:00 AM to 2:00 PM in Vancouver.
The overlap falls at 12:00 PM to 6:00 PM in Brasília, or 8:00 AM to 2:00 PM if you're in Vancouver. Vancouver is 4 hours behind Brasília, and with 6 hours of overlap you can even run back-to-back calls without stepping outside business hours. Watch the DST gap — when Vancouver changes its clocks and Brasília stays the same, this window slides by an hour.