Cairo is 5 hours ahead of Brasília
Best overlap: 8:00 AM to 1:00 PM in Brasília is 1:00 PM to 6:00 PM in Cairo.
Target 8:00 AM to 1:00 PM in Brasília, which lands at 1:00 PM to 6:00 PM for the Cairo side. Cairo is 5 hours ahead of Brasília, so you've got a workable 5-hour overlap — ideal for a standing meeting around 8:00 AM in Brasília (1:00 PM in Cairo). Daylight saving complicates things slightly: Cairo observes it, Brasília doesn't, so the difference flexes by an hour part of the year.