The purpose of this study was to examine whether a difference exists in TOEIC Bridge Institutional Program scores between Japanese EFL students at a technical college who engaged in ER for one year and those who did ER for two years. Furthermore, by dividing the students who experienced ER for two years into two subgroups according to their level of English achievement at the end of ER, their reading tendencies were statistically analyzed in terms of the number of words and books they had read. The results suggest that two-year-long ER may be more effective in improving TOEIC Bridge reading scores than a year-long ER program, and that students may be able to reach a high level of English proficiency without reading too many books as long as they are suited to the students’ levels. Additionally, students with high English proficiency made greater progress through ER.