6 months is 6 month out?

one year and one day from the date you first entered on your tourist visa.

you cannot stay 180 days anymore...

90 days, then leave for 3 month, and stay 90 days.

then leave again 3 month... that is a year...and 1 day...:-)

04/10/23 you cannot stay 180 days anymore...
90 days, then leave for 3 month, and stay 90 days.
then leave again 3 month... that is a year...and 1 day...:-)
-@Michel Duce

That depends on the country of origin.

• Citizens of most EU countries can only stay in Brazil for 90 days in every 180 days;
• Citizens of the major Anglosphere countries, most Latin American countries, and EU countries that have separate agreements with Brazil can stay for 90 days plus one 90 day extension, for up to 180 days in every 365.
• Citizens of other countries have individual visa regimes, all published on the QGRV, available online.

04/10/23 one year and one day from the date you first entered on your tourist visa.
-@Inubia

Agreed. Look at the 365 days prior to your planned return date to Brazil. Days drop off the back of that 365 day record one month at a time, and until it shows fewer than 180 days used, you can't return.