This research aimed at reporting two consecutive studies on the effects of extensive reading on reading comprehension and attitudes of Ethiopian second cycle primary school students. An intervention and a control group, selected from two intact grade 8 sections, were included in each study. The intervention group was exposed to extensive reading for 6 weeks and 12 weeks in the first and second study respectively. To collect data, reading comprehension tests and attitude questionnaires were used. The results revealed that there was no significant difference between the intervention and the control group in reading comprehension and attitudes toward reading when the time was restricted and only reading was used in the intervention. However, the intervention group scored significantly better than the control group in reading comprehension and attitudes toward reading when the time for reading was extended and motivating activities were included. Implications are deduced for time allocation and the use of motivating activities in the implementation of an extensive reading programme in input - poor EFL settings like Ethiopia.