visa waiver stamps have a general validity of 90 days, however this validity can be shorter for frequent travelers who enter and exit brazil often, depending on the total number of days spent in the country in the previous twelve months at the time of arrival.

a single-entry tourist visa has a general validity of 90 days, takes about 1-2 weeks for processing and the requirements are to submit a passport photo, show proof of a return ticket, and additional documentation depending on visa type.

also exempt from entry visas for up to 180 days are  Maritime foreign employees aboard foreign tourism vessels who hold an international maritime identity card, or equivalent document - but no remunerated work can be performed on land.

for any type of visa application, the passport has to be valid for a minimum of six months starting from the date the visa would be granted.