This roadmap applies to Project Fluency's Romance languages (Spanish, Italian, French, Portuguese) for English speakers. These share Latin roots and alphabets, making them the fastest languages to learn. English learning timelines vary based on your native language.
Research Sources: CEFR from Council of Europe framework. Time estimates from FSI data and Cambridge Assessment. Vocabulary thresholds from Nation (2006) and Schmitt research. Plateau mechanisms from Selinker (1972) and Klein's communicative needs satisfaction theory.