I've noticed that in the "days active" report it often does not match up with what the students' more detailed report shows. It does for some, but not others. For example, right now I have a student that shows 1 day active, but when I click on his name it shows activity for two different days this week.
I require kids to do Duolingo for homework 3-5 days a week, so these days active reports are pretty important for my homework grading.
Again, thanks for providing such an amazing teaching tool.