The current study analyzes the oral production of advanced learners of English who have Catalan and Spanish as their first languages. Subjects participated in study abroad (SA) programmes in English-speaking countries as part of their undergraduate studies. A role-play task was used to elicit speech from learners prior to SA and upon arrival from SA. We analyze two groups of learners who participated in a three-month stay (N = 33) and a six-month stay (N = 14). Their oral production is measured on the basis of syntactic complexity, and overall accuracy and fluency. Native speakers of English (N = 24) performed the same role-play task so as to provide a baseline. Statistical analyses show a significant advantage of the three-month stay in the target language country over the six-month stay in terms of accuracy and fluency, areas in which, nevertheless, native speakers outperformed both groups at pre- and post-test, regardless of length of stay (LoS).