One of the biggest frustrations for those who work or maintain international relationships is finding a time that works for both sides of a call. With very distant time zones, what's morning for one person might be the middle of the night for another. But with planning and the right information, it's possible to find comfortable windows for almost any combination.
For calls between Brazil (Brasília, UTC-3) and Portugal (Lisbon, UTC+0 in winter, UTC+1 in summer), the difference is only 3 to 4 hours — one of the smallest between continents. The ideal window is usually between 2 PM and 6 PM in Brazil, which corresponds to 5–9 PM in Portugal in winter. A comfortable slot for both sides.
With continental Europe (UTC+1 in winter, UTC+2 in summer), the difference is 4 to 5 hours. The most balanced period is between 1 PM and 5 PM in Brasília time, which corresponds to 5–9 PM or 6–10 PM in Europe — still within European business hours.
With the United States, it varies by coast. For the East Coast (UTC-5 in winter, UTC-4 in summer), there's a 2-hour difference with Brazil. The ideal overlap is between 9 AM and noon US time (11 AM–2 PM in Brasília). For the West Coast (UTC-8 in winter), the difference is 5 hours, and the best times for both sides are usually between 3 PM and 5 PM in Brazil.
With Asia, things get more challenging. Tokyo is 12 hours ahead of Brasília, meaning there is virtually no overlap in standard business hours. The usual solution is for one side to schedule the call outside normal hours — typically early morning in Brazil (8 AM) or early evening in Japan (8 PM).
The golden rule is to always confirm the current time zone difference before scheduling any call, especially during March and October when Daylight Saving Time changes in several countries. FusoMundo calculates this in real time for any pair of cities in the world.