CompTIA Exam TK0-201 Topic 4 Question 57 Discussion

The IT department has purchased some content and developed a training program that is content rich. The lessons are modular with assessments at the end of each module. Often times, the training does not meet the completion deadlines because of response times. Users have to repeat the assessments until they receive a passing grade. Which of the following would be the GREATEST concern in respect to learners' completion and retention?