Note that the immigration officer has the right to restrict your visa to less than 90 days, if he deems fit. (This has been done routinely for lone male travellers arriving in Fortaleza, allegedly to combat prostitution tourism.) He will then state the number of days (e.g. 60 or 30) http://jesuscristo73752.blogzet.com/nfree-coisas-para-saber-antes-de-comprar-8411232