Although several researchers have demonstrated that foreign language (FL) learning experience has a limited effect on the short-term development of second language (L2) fluency, recent studies have suggested that learners can gain long-term (over one year) benefits from FL learning experiences. As a part of the present study, 50 Japanese university students were exposed to L2 learning experience over the course of one academic year to monitor its impact on L2 fluency measures (i.e. speed, breakdown, and repair fluency) in FL context. The relationship between the development of L2 fluency measures and learners' learning experiences inside and outside the classroom was also investigated. The results showed a significant decrease in the length of between-clause and within-clause pauses that learners made. Furthermore, the correlational analysis showed that their L2 learning experience was uniquely associated with the development of between-clause pause frequency and repair frequency. These findings suggest that, while relatively long-term FL learning impacts the development of L2 fluency, it produces a unique pattern, whereby the effectiveness of FL learning is influenced by how students make the best use of their learning experiences.