São Paulo is 2 hours ahead of Dallas
Best overlap: 8:00 AM to 4:00 PM in Dallas is 10:00 AM to 6:00 PM in São Paulo.
The overlap falls at 8:00 AM to 4:00 PM in Dallas, or 10:00 AM to 6:00 PM if you're in São Paulo. Scheduling is forgiving here: with 8 hours of overlap, a missed slot just means picking another one the same day. Because only Dallas changes its clocks, the overlap above isn't fixed; expect a one-hour shift when Dallas enters or leaves daylight saving.