Rio de Janeiro is 5 hours behind Budapest
Best overlap: 1:00 PM to 6:00 PM in Budapest is 8:00 AM to 1:00 PM in Rio de Janeiro.
Keep meetings inside 1:00 PM to 6:00 PM in Budapest — that maps to 8:00 AM to 1:00 PM in Rio de Janeiro. Rio de Janeiro is 5 hours behind Budapest, leaving about 5 hours of daily overlap — enough for most meetings if you don't leave them too late in the day. Finally, Budapest observes daylight saving and Rio de Janeiro doesn't, so this window shifts by an hour for part of the year — recheck it each spring and autumn.