Portugal Golden Visa and Sustainable Investment Funds beyond Real Estate: A Winning Combination for obtaining Portuguese residency. These adjustments aim to channel investments into sectors that promote sustainable economic growth and cultural preservation. Applicants must maintain their investment for a minimum of five years and spend at least seven days in Portugal during the first year, with a minimum of 14 days in each subsequent two-year period. After five years, investors may apply for Portuguese citizenship, provided they meet basic language proficiency requirements. ​