I want test Moodle Machine Learning. I prepare 10 student account's and test course. Time between course start time and course end time is 8 minutes. 5 accounts going on the route to pass, 5 accounts only complete 1 of 4 activities. After 2 test's (and more) Moodle always predict: all student's account's is in student at risk of dropping out. I think that result's is because course time is too short. I have right? How is minimum course time to received good result's? Maybe i doing another mistake?