The purpose of this research is to present how university students' Test of English for International Communication Institutional Program (TOEIC IP) scores change after taking a 20-minute English extensive reading class during one semester. The research question was, "Is there a significant difference between the TOEIC IP scores from a 20-minute extensive reading class and those from a control class without extensive reading in a semester?" Extensive reading was conducted with first-year university students. Class A (n = 30) participated in the extensive reading; Class B (n = 32) did not take part in it. As a result, a t-test was conducted, and it showed the following significant difference between the TOEIC IP scores of Class A and those of Class B: t (60) = -2.46, p < 0.05. The answer to the research question was that there was in fact a significant difference between the TOEIC IP scores of the 20-minute extensive reading class and those of a control class without extensive reading in a semester. This suggests that extensive reading of easier books for university students can be effective for 20-minute increments in class and outside of class in a short period such as one semester.